Free email, phone and domain tools
371 tools, no code and no account. Paste an email, a phone number, a domain or a CSV and get a plain-English answer.
Check whether an email address is real or a phone number is valid, audit a domain’s mail records or work out what cleaning a list will cost. Every tool is free, needs no account and runs the same engine as the paid product, so you can judge the accuracy before paying for anything.
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- Domain and sendingNew
Llms.txt checker
Does this site have an llms.txt, and is it in the right format?Use it freePaste websites and see, for each, whether /llms.txt exists, whether it's Markdown with the H1, blockquote summary and linked H2 sections the llmstxt.org proposal describes, how many links it lists, and whether /llms-full.txt exists. - Domain and sendingNew
WWW redirect checker
Do the www and non-www versions of this site redirect to one HTTPS address?Use it freePaste domains and see, for each, where http://, https://, http://www. and https://www. end up, the redirect codes on the way, and whether the site is Consistent, uses temporary redirects, has one version that fails, is split into two copies, or doesn't send visitors to HTTPS. - Domain and sendingNew
TLD registry lookup
Who runs this domain extension, and can its domains be looked up with RDAP?Use it freePaste extensions, domains or URLs and see, for each top-level domain, its sponsoring organisation and technical contact's organisation from IANA's root zone records, when it entered the root, whether it's DNSSEC-signed, and whether its registry offers RDAP for domain lookups. - Domain and sendingNew
Security.txt checker
Does this site have a valid security.txt file?Use it freePaste websites and see, for each, whether /.well-known/security.txt exists, has the required Contact and Expires fields, hasn't expired and follows RFC 9116, with every contact listed. - Domain and sendingNew
Ads.txt checker
Is this site's ads.txt valid, and which ad systems does it list?Use it freePaste publisher domains and see, for each, whether /ads.txt exists, how many DIRECT and RESELLER records it has, which ad systems it names, its OWNERDOMAIN and MANAGERDOMAIN, and every line a buyer's crawler will skip. - Domain and sendingNew
Bulk SOA record lookup
What are the SOA serial and timers for these domains?Use it freePaste domains and get each zone's SOA record: primary name server, hostmaster address, serial (and whether it reads as a date), refresh, retry, expire and the negative-caching TTL, with timers outside the RFC 1912 and RFC 2308 suggestions flagged. - Email and listsNew
Bulk MX lookup
Which domains on my email list have no mail server?Use it freePaste addresses or domains and get each domain's MX hosts and provider, with domains that can't take mail (no MX, null MX, not registered) flagged and their addresses ready to copy. - Email and listsNew
Email list overlap checker
How much do my email lists overlap?Use it freeCompare up to six lists or CSVs: an overlap count for every pair, addresses on every list or on only one, and a merged deduplicated download with which lists each address came from. - Email and listsNew
Invisible character remover for emails
Why does my import reject email addresses that look correct?Use it freeShows and removes the characters you can't see in a pasted list or CSV: zero-width spaces, no-break spaces, bidi marks, full-width @ and dots, smart quotes and mailto: wrapping, naming each one by code point. - Email and listsNew
Email and name match checker
Which emails on my lead list don't belong to the person named?Use it freeCompares each row's address with its first and last name: full match, first name only, last name only, initials, role inbox or no match, with the pattern found. Catches enrichment mix-ups before a send. - Email and listsNew
Email list A/B splitter
How do I split my email list randomly for an A/B test?Use it freeDeal a list or CSV into 2 to 5 random test groups plus an optional holdout, with Gmail, Outlook and company addresses spread evenly and the same inbox kept in one group. - Email and listsNew
Email list sorter
How do I sort an email list by domain?Use it freeSort addresses or a whole CSV by domain, mailbox provider, domain ending (.de, .co.uk) or address, in either direction, with the rows' other columns kept and a group column added.
Verify and clean a list
Start here to find out which addresses on a list will bounce. The email checker asks one mailbox's server whether it exists; the list tools below remove duplicates, typo domains, invisible characters, role, free and throwaway addresses and domains with no mail server, and check a whole file against Gmail, Outlook, Yahoo and other providers before you pay to send.
- Email and listsMost used
Email checker
Is this one address real?Use it freeA live SMTP mailbox check on a single address, with catch-all and disposable detection. Five checks a minute. - Email and lists
List health check
What is wrong with this list before I verify it?Use it freePaste emails or drop a CSV of up to 5,000 rows for a quality score out of 100: duplicates, bad syntax, typo domains, disposable, role and dead domains. Runs in your browser. - Email and lists
Bulk email checker
Can I check a whole list of emails at once?Use it freePaste a list of addresses and get every check that needs no mail server for all of them, plus a live mailbox check on 10, without an account. - Email and lists
Bulk Outlook email checker
Which Outlook and Hotmail addresses on my list are usable?Use it freeChecks many outlook.com, hotmail.com, live.com and msn.com addresses at once: typo domains like hotmial.com, duplicates and +tag repeats flagged, and says plainly what Microsoft lets a checker confirm. - Email and lists
Bulk Yahoo email checker
Which Yahoo addresses on my list are usable?Use it freeChecks many yahoo.com, ymail.com and rocketmail.com addresses at once: typo domains like yaho.com, duplicates and Yahoo disposable addresses that share one inbox flagged, with what Yahoo can't confirm said plainly. - Email and lists
Bulk iCloud email checker
Which iCloud addresses on my list are real?Use it freeChecks many icloud.com, me.com and mac.com addresses at once: typo domains, duplicates, Sign in with Apple relay addresses and the same name at two Apple domains flagged, and 10 mailboxes checked live. - Email and lists
Bulk AOL email checker
Which AOL addresses on my list are usable?Use it freeChecks many aol.com, aim.com and aol.co.uk addresses at once: typo domains like aoll.com, duplicates and +tag repeats flagged, with why AOL's servers can't confirm a single mailbox said plainly. - Email and lists
CSV email verifier
Which addresses in my CSV will bounce?Use it freeFinds the email column in any CSV, removes bad syntax, duplicates, typo and dead domains and disposable addresses, keeps your other columns, then checks 10 mailboxes live. - Email and lists
Excel email verifier
How do I validate the emails in my Excel sheet?Use it freeReads an .xlsx or cells pasted from Excel, checks format, duplicates, typo and dead domains and disposable addresses, and checks 10 mailboxes live. No formulas or macros needed. - Email and lists
Google Sheets email verifier
Are the emails in my Google Sheet real?Use it freePaste cells copied from Google Sheets (or upload the CSV download) to check format, duplicates, typo and dead domains and disposable addresses, then 10 live mailbox checks. - Email and lists
Catch-all checker
Does this domain accept mail for every address?Use it freeA live SMTP probe of a random address at the domain, plus its MX hosts. Five checks a minute. - Domain and sending
Bulk catch-all checker
Which of these domains accept mail for any address?Use it freePaste domains or email addresses and see, for each domain, whether its mail server accepts a made-up address: catch-all, not catch-all or unknown, with the reason. - Email and lists
Disposable checker
Is this address temporary?Use it freeInstant lookup against thousands of known throwaway providers. No rate limit — it is a list lookup, not a network call. - Email and lists
Bulk disposable email checker
How do I remove temporary emails from a list?Use it freePaste a list or upload a CSV. Each address is checked against a list of disposable domains and its domain's MX records, then you download the list without them. - Email and lists
Email list cleaner
How do I split names and emails into separate columns?Use it freePaste "Name <email>" lists, Outlook recipients or messy CSV rows and get email, first name and last name columns, trimmed, lowercased, typo-fixed (gmial.com to gmail.com), invalid rows removed and deduplicated. In your browser. - Email and lists
Remove duplicate emails
How do I remove duplicate emails from my list?Use it freeCase-insensitive deduplication for a pasted list or a whole CSV, keeping every other column. Merge a second list, subtract a suppression list, optional Gmail dot and +tag matching. Runs in your browser. - Email and lists
Email typo fixer
How do I fix gmial.com and other email typos in my list?Use it freePaste a list or upload a CSV to correct misspelled webmail domains, .con endings and formatting slips, with each fix shown for you to accept or reject. Runs in your browser. - Email and listsNew
Bulk MX lookup
Which domains on my email list have no mail server?Use it freePaste addresses or domains and get each domain's MX hosts and provider, with domains that can't take mail (no MX, null MX, not registered) flagged and their addresses ready to copy. - Email and listsNew
Invisible character remover for emails
Why does my import reject email addresses that look correct?Use it freeShows and removes the characters you can't see in a pasted list or CSV: zero-width spaces, no-break spaces, bidi marks, full-width @ and dots, smart quotes and mailto: wrapping, naming each one by code point. - Email and lists
Bulk Gravatar checker
Which email addresses on my list have a Gravatar?Use it freeHash each address in your browser and ask Gravatar whether an avatar exists for it, 500 a run, with thumbnails, profile links and a CSV. A Gravatar shows someone set the address up once. - Email and lists
Bulk email syntax checker
Which addresses on my list are badly formatted, and why?Use it freePaste or upload any number of addresses and get the exact format error on each one, with the RFC rule it breaks and a fix for typo domains. Syntax only, in your browser. - Email and lists
Role-based email filter
Which addresses on my list are info@, sales@ or noreply@?Use it freeFlag or remove role-based addresses in bulk, using 148 prefixes in three groups, with your CSV columns kept. Runs in your browser. - Email and lists
Business email filter
Which addresses are work emails and which are Gmail or Yahoo?Use it freeSplit a list into company addresses and free ones (Gmail, Outlook.com, Yahoo, ISP mail) using 158 free mailbox domains, and download each part. - Email and lists
Gmail address normalizer
Which of these signups are the same Gmail inbox?Use it freeTurn [email protected] and [email protected] into one canonical address, grouped and counted, without deleting rows. Runs in your browser. - Email and lists
Free email domains list
Where can I get a list of free email domains?Use it freeSearch or download the 158 freemail and ISP domains our own filters use, as CSV, JSON, TXT or a JavaScript Set. - Email and lists
Email regex tester
Which email regex should I use, and what does it let through?Use it freeRuns your addresses through four standard patterns and your own, shows where they disagree, and gives code that behaves the same in JavaScript, Python, PHP and Go. - Email and lists
Signup email risk checker
Which of my signups are fake?Use it freePaste or upload signup emails. Each one is checked for disposable, parked, brand-new or dead domains, typos and role addresses, with the reason for every flag. - Email and lists
Bounce rate estimator
How much will my email list bounce?Use it freePaste a list or enter counts and get a bounce rate range from the problems visible in the addresses and their domains. Clearly an estimate, not a verification. - Email and lists
Email verifiability checker
Why do so many emails come back risky or unknown?Use it freePaste a list and see, domain by domain, whether a mailbox check can give a definite answer, will come back risky, or is on a domain with no MX record, before you check anything. - Email and lists
Gmail address checker
Is this Gmail address a real account?Use it freeAsks Google's own mail servers whether a gmail.com or googlemail.com mailbox exists, without sending anything, and shows the one inbox dotted and +tagged spellings reach. - Email and lists
Outlook email checker
Is this Outlook or Hotmail address usable?Use it freeChecks outlook.com, hotmail.com, live.com and msn.com addresses for syntax, typo domains, mail servers and disposable or role use, and says plainly that the mailbox isn't confirmed while Microsoft refuses our checks. - Email and lists
Yahoo email checker
Is this Yahoo or AOL address real?Use it freeRuns a live mailbox check on yahoo.com, ymail.com, rocketmail.com and aol.com addresses, catch-all test first, and explains why Yahoo often returns risky instead of a clear answer. - Email and lists
iCloud email checker
Is this iCloud address usable?Use it freeChecks icloud.com, me.com and mac.com addresses for syntax, typo domains, mail servers and disposable or role use, then asks Apple's mail server whether the mailbox exists. - Email and lists
Business email checker
Is this one address a real work email?Use it freeSays whether an address is on a company domain or a free mailbox service, names the mail host from MX, flags shared inboxes like info@, then runs a live mailbox check. - Email and lists
Google Workspace email checker
Does this address at a Google Workspace company exist?Use it freeConfirms from MX that a company domain's mail runs on Google, then asks Google's server about the one mailbox, catch-all test first, without sending anything. - Email and lists
Microsoft 365 email checker
Does this address at a Microsoft 365 company exist?Use it freeConfirms from MX that a company domain runs on Exchange Online, then asks Microsoft's server about the one mailbox, catch-all test first, without sending anything. - Email and lists
Zoho email checker
Is this Zoho Mail address real?Use it freeChecks zoho.com and zohomail.com addresses and company domains whose MX points at Zoho, with a live mailbox check that tests for a catch-all address first. - Email and lists
Proton Mail email checker
Is this Proton Mail address usable?Use it freeChecks proton.me, protonmail.com and pm.me addresses and custom domains on Proton, and says plainly when Proton's server doesn't confirm the mailbox. - Email and lists
AOL address checker
Is this AOL address usable?Use it freeChecks aol.com, aim.com and aol.co.uk addresses for syntax, typo domains, mail servers and disposable or role use, and says plainly that AOL's servers won't confirm a single mailbox. - Email and lists
GMX address checker
Is this GMX address usable?Use it freeChecks gmx.com, gmx.net, gmx.de, gmx.at and gmx.ch addresses for syntax, typo domains, mail servers and disposable or role use, and says plainly when GMX refused the mailbox check. - Email and lists
Yandex address checker
Is this Yandex address a real mailbox?Use it freeAsks Yandex's own mail server whether a yandex.ru, yandex.com or ya.ru mailbox exists, without sending anything, after syntax, domain, disposable and role checks. - Email and lists
Mail.ru email checker
Is this Mail.ru address real?Use it freeChecks mail.ru, inbox.ru, list.ru, bk.ru and internet.ru addresses for syntax, typo domains, mail servers and disposable or role use, and says plainly that Mail.ru's server won't confirm a single mailbox. - Email and lists
WEB.DE email checker
Does this WEB.DE address exist?Use it freeChecks a @web.de address for syntax, typo domains, mail servers and disposable or role use, then asks WEB.DE's mail server about the mailbox and says plainly when WEB.DE turned the check away. - Email and lists
Comcast email checker
Is this comcast.net address usable?Use it freeChecks comcast.net (Xfinity) addresses for syntax, typo domains, mail servers and disposable or role use, and says plainly when Comcast refused the mailbox check. - Email and lists
AT&T email checker
Is this AT&T address real?Use it freeChecks att.net and the legacy AT&T domains (sbcglobal.net, bellsouth.net, pacbell.net and more) for syntax, typo domains, mail servers and disposable or role use, and says plainly that AT&T's Yahoo-run servers won't confirm a mailbox. - Email and lists
Will this email bounce?
Will my email to this address bounce?Use it freeAsks the address's mail server whether the mailbox exists, without sending anything, and answers yes, likely, unlikely or can't tell, with the reason and what to do. - Email and lists
Cold email list checker
Is my lead list safe to upload to my sending tool?Use it freeChecks a lead CSV before it reaches your sequencer: syntax, duplicates, typo and dead domains, disposable and role addresses, your do-not-contact list, then 10 live mailbox checks. - Email and lists
Verification results cleaner
What do I do with catch-all and unknown results?Use it freeReads a results CSV from any email verifier, maps each status (valid, catch-all, unknown, do_not_mail, spamtrap, accept_all...) to send, retest or remove, and gives you a file for each. - Email and lists
Bounced email extractor
Which addresses bounced, and which should I remove?Use it freePulls every bounced recipient out of pasted bounce messages, .eml or .mbox files and bounce logs, sorts each by its SMTP code into remove, retry or fix-your-sending, and builds a suppression CSV. - Email and lists
Verifier comparison
Why do two email verifiers give different results on my list?Use it freeMatches two verifiers' results files by address, maps each status to valid, risky or invalid, and lists every row where they disagree with the likely reason: catch-all policy, unknown answers, role flags or a real conflict. - Email and lists
Remove emails by domain
How do I remove all emails from certain domains from my list?Use it freeTakes your list and your exclusion rules (a domain and its subdomains, an ending such as .edu or .gov.uk, a name on any ending such as acme.*, or single addresses) and splits the list into kept and removed, with the rule that matched each. - Email and lists
Duplicate contact finder
How do I find the same person listed twice with different email addresses?Use it freeGroups rows by first and last name plus company (the company column, or the domain after the @), and by Gmail dot and +tag variants, then keeps one row per person: the work address over Gmail or Outlook, or the first in the file. - Email and lists
Bulk Gmail checker
Which Gmail addresses on my list are real?Use it freeChecks many Gmail addresses at once: merges the same inbox written with dots, +tags or googlemail.com, flags username-rule breaks and typo domains, and asks Google about 10 mailboxes live. - Email and lists
Fake email checker
How do I spot fake email addresses in my list?Use it freeFlags addresses that look invented from their text alone: keyboard runs like asdf, placeholders like test@, reserved domains such as example.com, and random strings. Runs in your browser. - Email and lists
Email validation code generator
How do I validate an email address in my signup form?Use it freeCopy-paste snippets for the input, a browser-side typo hint and a server-side mailbox check in Node.js, Python, PHP or cURL, with a choice of what to do when the verdict is risky. - Email and lists
International email checker
How do I handle email addresses with accents or non-Latin characters?Use it freeFinds non-ASCII domains and names in a list, shows each domain's punycode (xn--) form, flags names that need SMTPUTF8 and warns about domains that mix alphabets. In your browser.
Export a list from your store or payments
Turn a customer export from Shopify, WooCommerce, Stripe, Square, PayPal and other store or payment tools into one clean email column. Each tool reads that platform's own CSV headers, sets aside customers who unsubscribed or don't accept marketing where the export records it, and removes duplicates, so the file is ready to verify and import.
- Email and lists
Shopify customers to email list
How do I get an email list of my Shopify customers who accept marketing?Use it freeReads the Shopify customers export (or an orders export, one row per line item) and gives one row per customer: name, country, Accepts Email Marketing, total spent, orders and tags. Subscribers and non-subscribers download as separate files. - Email and lists
Shopify email list checker
How do I clean my Shopify customer emails before a campaign?Use it freeReads a Shopify customers CSV, flags bad syntax, duplicates (including Gmail dots and +tags), typo, dead and disposable domains, and removes your unsubscribed list. Domains go to DNS; addresses stay in your browser. - Email and lists
WooCommerce customers to email list
How do I export my WooCommerce customers' email addresses?Use it freeReads the WooCommerce Customers or Orders download (or an order-export plugin file, or a WordPress users export) and gives one row per billing address with orders, paid orders, total spent and last order. Failed, cancelled and refunded orders don't count as paid; staff accounts can be set aside. - Email and lists
BigCommerce customers to email list
How do I get an email list of my BigCommerce customers?Use it freeReads the customers CSV from BigCommerce (Customers > Export, Bulk Edit template), reads a newsletter, marketing or Receive Review/Abandoned Cart Emails? column when the file has one, sets aside opt-outs, merges repeats and keeps company, phone and customer group. - Email and lists
Wix contacts to email list
How do I export my Wix contacts as an email list?Use it freeReads the Regular CSV from Wix Contacts > Import / Export > Export, sorts each contact by its email subscriber status (subscribed, never subscribed, unsubscribed), sets aside unsubscribes, merges repeats and keeps name, phone, company and labels. - Email and lists
Squarespace contacts to email list
How do I export my Squarespace subscribers to another email tool?Use it freeReads the subscribed CSV from a Squarespace mailing list export (Lists & Segments > Export) or a contacts/profiles export, reads Accepts Marketing or a subscription column when there is one, merges repeats and keeps names and lists. - Email and lists
Square customers to email list
How do I get an email list of my Square customers?Use it freeReads the customer export from the Square Dashboard, sorts each customer by Email Subscription Status (Subscribed, Unknown, Unsubscribed; older files' Email Unsubscribed column too), sets aside unsubscribes, merges repeats and keeps phone, visits, spend and groups. - Email and lists
Clover customers to email list
How do I get an email list of my Clover customers?Use it freeReads the customer CSV from the Clover web dashboard (Customers > Export), splits cells that hold several addresses into one row each, reads a marketing-allowed column when the file has one, sets aside opt-outs and merges repeats with phone kept. - Email and lists
Stripe customers to email list
How do I get a clean email list of my Stripe customers?Use it freeReads unified_customers.csv or unified_payments.csv from Stripe. Customers with the same email (Stripe doesn't deduplicate customers by email) become one row with the IDs listed, total spend and payment count added, delinquent and subscription status kept. - Email and lists
PayPal customers to email list
How do I get a list of my customers' emails from PayPal?Use it freeReads PayPal's Activity download CSV, keeps the From Email Address of incoming payments, skips your own address, payments you sent, transfers, fees, conversions and holds, merges repeat buyers with payments and totals, and marks refunds. - Email and lists
QuickBooks customers to email list
How do I export all my customers' email addresses from QuickBooks?Use it freeReads a QuickBooks Online or Desktop customer export (title rows and TOTAL lines skipped), Xero contacts (EmailAddress and Person1Email…Person5Email), FreshBooks or Wave clients. Cells holding several addresses are split, CC columns read, an address shared by several customers kept once, inactive customers set aside. - Email and lists
Gumroad customers to email list
How do I export my Gumroad customers' email addresses?Use it freeReads a Gumroad sales CSV (Purchase Email, Item Name, Sale Price, Refunded?, Disputed?, Giftee Email), a Lemon Squeezy orders export, Paddle transactions or a Payhip sales file. Sales fold into one row per buyer with purchases, products and spend; refunded, disputed or failed sales add nothing to spend, and buyers with only those are set aside. - Email and lists
Kajabi contacts to email list
How do I export my Kajabi contacts or Teachable students to another email tool?Use it freeReads a Kajabi contacts export (Products, Tags, Subscribed), Teachable or Thinkific students, Skool members or Podia customers. Rows fold per address with products or courses joined and tags kept; people who unsubscribed from marketing and staff accounts (owner, admin, instructor, moderator) are set aside, and buyers can be split from free opt-ins.
Export a list from your email platform
Clean an audience export from Mailchimp, Klaviyo, Kit, MailerLite, GetResponse, Omnisend, Drip, Flodesk, Brevo, ActiveCampaign, Constant Contact, AWeber or a newsletter tool before you re-import it or move platforms. The tools read each platform's export columns, set aside unsubscribed and bounced contacts where the export marks them, and give you a list you can verify, so dead addresses stop counting toward a contact-based bill.
- Email and lists
Mailchimp list cleaner
How do I clean my Mailchimp audience before a send?Use it freeReads Mailchimp's subscribed export, removes what Mailchimp would only find by bouncing (typo, dead and disposable domains), takes off your cleaned and unsubscribed contacts, then checks 10 mailboxes. - Email and lists
Klaviyo list cleaner
How do I clean my Klaviyo list before a campaign?Use it freeReads a Klaviyo profiles CSV, flags bad syntax, duplicates, typo, dead and disposable domains, and takes off your suppressed profiles. Domains go to DNS; addresses stay in your browser. - Email and lists
Mailchimp audience to email list
How do I export my Mailchimp audience to a plain email list?Use it freeReads a CSV from Mailchimp's audience export ZIP: Email Address, names and TAGS kept, repeats merged; rows from the unsubscribed file (UNSUB_TIME) or the cleaned file (CLEAN_TIME) are set aside, so the same tool builds a suppression list. - Email and lists
Klaviyo profiles to email list
How do I export Klaviyo profiles to an email list without the suppressed ones?Use it freeReads a Klaviyo list or segment CSV: Email marketing consent sorted into subscribed, never subscribed and unsubscribed; any Email suppressions value sets the profile aside even when consent says Subscribed; repeats merged. - Email and lists
Kit subscribers to email list
How do I export Kit (ConvertKit) subscribers to a clean email list?Use it freeReads a Kit subscriber CSV: Status sorted into confirmed (kept), unconfirmed (kept as unknown), unsubscribed (set aside) and bounced, complained or blocked (always set aside); tags kept, repeats merged. - Email and lists
MailerLite subscribers to email list
How do I export MailerLite subscribers to a clean email list?Use it freeReads a MailerLite subscriber CSV: Status sorted into active (kept), unconfirmed (kept as unknown), unsubscribed (set aside) and bounced or junk (always set aside); groups kept as labels, repeats merged. - Email and lists
GetResponse contacts to email list
How do I export GetResponse contacts to a plain email list?Use it freeReads a GetResponse contacts CSV or XLSX: one row per address with list names kept as labels and repeats across lists merged; a status or unsubscribe-reason column, when present, sets removed, unsubscribed and bounced contacts aside. - Email and lists
Omnisend contacts to email list
How do I export Omnisend contacts to a clean email list?Use it freeReads an Omnisend contacts CSV: Email subscription status sorted into subscribed (kept), non-subscribed (kept as unknown) and unsubscribed (set aside, which in Omnisend also covers bounces and spam complaints); tags and total spent kept, repeats merged. - Email and lists
Drip subscribers to email list
How do I export Drip subscribers to a clean email list?Use it freeReads a Drip people CSV: the status column (active or unsubscribed) decides what is kept, tags are kept as labels and repeats merge; Drip's own columns such as created_at, confirmed_at and lead_score are recognised. - Email and lists
Flodesk subscribers to email list
How do I export Flodesk subscribers without the unsubscribed and bounced ones?Use it freeReads a Flodesk subscriber CSV, which holds every status: Active kept, Unconfirmed kept as unknown, Unsubscribed and Archived set aside, Bounced, Complained (marked spam) and Cleaned always set aside; segments kept as labels, repeats merged. - Email and lists
Constant Contact contacts to email list
How do I move my Constant Contact contacts to another email tool without the unsubscribes?Use it freeReads a Constant Contact contacts export, sorts each contact by its email permission status (explicit, implicit, pending, unsubscribed), sets aside unsubscribes and bounces, merges repeats and keeps name, company, lists and tags. - Email and lists
Brevo contacts to email list
How do I export my Brevo contacts without the blocklisted ones?Use it freeReads a Brevo contacts export (comma or semicolon separated), sets aside contacts marked blocklisted or unsubscribed, reads FIRSTNAME/LASTNAME or PRENOM/NOM, merges repeats and keeps phone and lists. - Email and lists
ActiveCampaign contacts to email list
How do I export my ActiveCampaign list without unsubscribed and bounced contacts?Use it freeReads an ActiveCampaign list export with its Status column, keeps Active contacts, sets aside Unsubscribed and Bounced ones, marks Unconfirmed as unknown, merges repeats and keeps phone, organization and tags. - Email and lists
AWeber subscribers to email list
How do I export my AWeber subscribers to another email platform?Use it freeReads an AWeber subscriber CSV, keeps subscribed contacts, sets aside unsubscribed, deleted and complained ones, marks unconfirmed as unknown, merges repeats across lists and keeps name and tags. - Email and lists
Newsletter subscribers to email list
How do I move my Substack or beehiiv subscribers to another platform without re-adding unsubscribes?Use it freeReads a subscriber export from Substack, beehiiv, Kit (ConvertKit), Ghost or MailerLite and sorts every row into active, unconfirmed, unsubscribed, bounced or complained from that platform's own status columns. Only active subscribers are kept by default; paid subscribers are marked.
Export a list from your CRM or address book
Pull the email addresses out of a HubSpot, Salesforce, Pipedrive, Zoho, Close, Freshsales, GoHighLevel, Keap or Copper export, or a Google or Outlook contacts file. Each tool reads that CRM's email columns, sets aside contacts it marks bounced, invalid or opted out, and drops duplicates, so you can verify the list before a campaign.
- Email and lists
HubSpot email list checker
Which HubSpot contacts will hard bounce?Use it freeReads a HubSpot contacts export (CSV or .xlsx), flags what HubSpot only learns by bouncing, removes contacts on your bounced or unsubscribed export, and checks 10 mailboxes live. - Email and lists
HubSpot contacts to email list
How do I export HubSpot contacts to an email list without the unsubscribed and bounced ones?Use it freeReads a HubSpot contacts CSV or .xlsx: Unsubscribed from all email and Opted out of email columns set aside, Email hard bounce reason, Invalid email address and Email address quarantined set aside, additional emails optional, repeats merged. - Email and lists
Salesforce contacts to email list
How do I export Salesforce contacts to an email list without the opted-out and bounced ones?Use it freeReads a Salesforce Contacts or Leads report (Details Only CSV) or Data Loader file: Email Opt Out / HasOptedOutOfEmail read only as an opt-out, Email Bounced Reason or Date set aside, Other Email optional, repeats merged. - Email and lists
Pipedrive contacts to email list
How do I export Pipedrive contacts to an email list without the unsubscribed ones?Use it freeReads a Pipedrive People CSV or .xlsx: Email - Work first, Email - Home and Email - Other optional, Marketing status Unsubscribed set aside (Subscribed and No consent never read as consent), Person - prefixes stripped, repeats merged. - Email and lists
Zoho CRM contacts to email list
How do I export Zoho CRM contacts to an email list without the opted-out ones?Use it freeReads a Zoho CRM Contacts or Leads CSV (Setup > Data Administration > Export): Email Opt Out true, Unsubscribed Mode or Unsubscribed Time set aside, never read as consent when blank or false; Secondary Email optional; repeats merged. - Email and lists
Close CRM leads to email list
How do I export contacts from Close CRM to a clean email list?Use it freeReads a Close contacts or leads CSV: contact email (or primary contact email), extra emails optional, several addresses in one cell split, unsubscribed / do-not-email read only as an opt-out, lead name kept as company, repeats merged. - Email and lists
Freshsales contacts to email list
How do I export Freshsales contacts without the unsubscribed and bounced ones?Use it freeReads a Freshsales contacts export, sets aside unsubscribed contacts (never reading a blank as consent) and those with an Email status of bounced or invalid, splits the Emails cell into one row per address, merges repeats and flags role addresses and typos. - Email and lists
GoHighLevel contacts to email list
How do I export GoHighLevel contacts and drop the DND ones before a campaign?Use it freeReads a HighLevel contacts CSV, sets aside contacts with DND on (a blank or false DND is never read as consent), reads Additional Emails when asked, merges repeats with their tags combined and flags role addresses and likely domain typos. - Email and lists
Keap contacts to email list
How do I export Keap contacts to an email list without the opted-out and bounced ones?Use it freeReads a Keap contacts CSV: the email status sorted into opt-outs (Opt-Out, List Unsubscribe, Reported SPAM, Non-marketable), bounces (Hard Bounce, Invalid) and contacts you can still email; Email 2 and Email 3 optional, repeats merged. - Email and lists
Copper CRM contacts to email list
How do I export Copper CRM contacts to an email list?Use it freeReads a Copper People export (.xlsx or CSV): Work Email as the address, Personal and Other Email optional, a custom Do Not Email, opt-out or unsubscribed column read only as an opt-out, an email status of bounced set aside; repeats merged. - Email and lists
CRM export to email list
How do I turn a Salesforce or HubSpot export into a send list without the opt-outs?Use it freeReads a contacts or leads export from Salesforce, HubSpot, Zoho CRM, Pipedrive or another CRM, finds the opt-out, bounce and marketing-status columns by name, and splits it into a send list and a set-aside file with the reason per address. Repeats merged; an opt-out on any copy wins. - Email and lists
Google Contacts to email list
How do I export all the email addresses from Google Contacts?Use it freeReads the Google CSV that Google Contacts exports, pulls every address out of the E-mail 1, 2, 3 Value columns (including cells joined with :::), removes repeats and marks each work or personal. - Email and lists
Outlook contacts to email list
How do I export all the email addresses from Outlook?Use it freeReads an Outlook CSV export of contacts (E-mail, E-mail 2, E-mail 3 Address) or of a mail folder (From, To and CC addresses), skips Exchange /O= paths, removes repeats and marks each address work or personal.
Export a list from a lead database
Clean an Apollo, ZoomInfo, Lusha, RocketReach, Seamless.AI, Cognism, Hunter, Snov.io, Clay or Sales Navigator export before it goes into a sequence. The tools read each vendor's email and status columns, set aside addresses the vendor itself marked invalid (and, if you choose, catch-all or unverified ones), and remove duplicates. Lead data ages as people change jobs, so verify what is left before sending.
- Email and lists
Apollo export email checker
Which rows of my Apollo export should I re-check?Use it freeReads an Apollo CSV, counts its Email Status values, flags bad syntax, duplicates, dead and disposable domains, and sends the rows not marked Verified to a live mailbox check first. - Email and lists
Apollo contacts to email list
How do I turn an Apollo export into a clean email list for a sequence?Use it freeReads an Apollo contacts CSV: Email first, Secondary and Tertiary email when asked; Email status read as verified, risky (Unverified, Catch-all, User-managed, Update required) or invalid; a TRUE in Email bounced sets the address aside; repeats merged, role addresses set aside. - Email and lists
ZoomInfo export to email list
How do I clean a ZoomInfo export before I put it in a cold email sequence?Use it freeReads a ZoomInfo contacts CSV, keeps the main email and (if asked) supplemental emails, merges repeats, carries the Contact Accuracy Score through, flags role addresses, personal webmail, likely typos and emails on a domain other than the company website. - Email and lists
Lusha export to email list
How do I clean a Lusha export before I email the contacts?Use it freeReads a Lusha CSV, uses the work email as the send address (private emails only when asked), reads an email confidence grade (A+ and A as verified, B and below as risky), merges repeats and flags role addresses, webmail and domain mismatches. - Email and lists
RocketReach export to email list
Are RocketReach emails safe to send to, and how do I clean the export?Use it freeReads a RocketReach list export, uses the recommended (professional) email as the send address, reads the email grade (A as verified, A- and B as risky, invalid set aside), merges repeats and flags role addresses, webmail and domain mismatches. - Email and lists
Seamless.AI export to email list
How do I clean a Seamless.AI export and handle the Accept All emails?Use it freeReads a Seamless.AI CSV (Clean, Raw or Custom download), uses Email 1 as the send address, reads its validation (Valid as verified, Accept All as risky, Invalid set aside), carries the Total AI score, merges repeats and flags role addresses, webmail and domain mismatches. - Email and lists
Cognism export to email list
How do I export a Cognism list to CSV and clean it before a sequence?Use it freeReads a Cognism list CSV, reads an email quality or verified column (verified, unverified, invalid), sets aside invalid and role addresses, merges repeats and flags personal webmail, typos and emails on a domain other than the company website. - Email and lists
Hunter export to email list
How do I clean a Hunter.io export before I put it in a sequence?Use it freeReads a Hunter leads export or bulk results CSV, reads Verification status (valid, accept-all, unknown, invalid), keeps the confidence score as written, sets aside invalid and role addresses, merges repeats and flags webmail, typos and domain mismatches. - Email and lists
Snov.io export to email list
How do I clean a Snov.io prospect list export before a campaign?Use it freeReads a Snov.io prospect list CSV or XLSX, reads Email status (valid, unknown, not valid), sets aside not-valid and role addresses, keeps Email 2 out unless asked, merges repeats and flags webmail, typos and emails off the company website's domain. - Email and lists
Clay table to email list
How do I export a Clay table to CSV and get a clean list of emails out of it?Use it freeReads a Clay table CSV, finds the work email column (personal email only when asked), reads a validation column (valid, catch-all, invalid), counts rows where enrichment found nothing, merges repeats and flags role addresses, webmail and domain mismatches. - Email and lists
Sales Navigator leads to email list
How do I turn a Sales Navigator lead list into an email list I can send to?Use it freeReads a Sales Navigator lead list exported through your CRM or the enrichment tool that found the emails, reads its email status column (valid, catch-all, risky, invalid), merges repeats and flags role addresses, webmail and emails on a domain other than the company website. - Email and lists
LinkedIn connections to email list
How do I turn my LinkedIn connections export into an email list?Use it freeReads Connections.csv as LinkedIn exports it, skips the notes at the top, keeps the connections that shared an email and splits work from personal addresses.
Export a list from your sequencer, with a suppression list
Get the leads out of Instantly, Smartlead, lemlist, Reply.io, Woodpecker or Saleshandy with their campaign status, so bounced, replied and unsubscribed contacts are split out before you reuse a list. The suppression list merger joins every do-not-contact file you have into one, which you load back into the sequencer before the next send.
- Email and lists
Instantly leads to email list
How do I export Instantly leads and separate the bounced and unsubscribed ones?Use it freeReads an Instantly leads CSV, reads Lead Status (bounced, unsubscribed, replied, completed), Interest Status (interested, meeting booked, not interested) and Verification Status (invalid, risky, catch-all), and splits it into reusable leads and a suppression file. - Email and lists
Smartlead leads to email list
How do I export Smartlead leads and build a suppression list from the bounces and unsubscribes?Use it freeReads a Smartlead leads CSV: status (completed, stopped, blocked), lead category (Interested, Meeting Request, Not Interested, Do Not Contact, Wrong Person), is_unsubscribed and reply_count; bounced and unsubscribed always set aside, replied and not-interested by choice. - Email and lists
lemlist leads to email list
How do I export lemlist leads and build a suppression list from the bounces and unsubscribes?Use it freeReads a lemlist leads CSV, reads lastState or status (bounced, unsubscribed, interested, not interested, replied) and emailStatus, sets aside bounced and unsubscribed always, replied and not-interested by choice, merges the same lead across campaigns. - Email and lists
Reply.io contacts to email list
How do I export Reply.io contacts and separate the bounced and opted-out ones?Use it freeReads a Reply.io People CSV: status (Active, Finished, Replied, Bounced, Opted out), Opted out and Bounced columns when present, reply category; bounced and opted out always set aside, replied and not-interested by choice. - Email and lists
Woodpecker prospects to email list
How do I export Woodpecker prospects and build a suppression list?Use it freeReads a Woodpecker prospects CSV: status (ACTIVE, BOUNCED, INVALID, OPT-OUT, BLACKLIST, REPLIED, AUTOREPLIED) and interest level (INTERESTED, MAYBE_LATER, NOT_INTERESTED); bounced, invalid and opted out always set aside, replies by choice. - Email and lists
Saleshandy prospects to email list
How do I export Saleshandy prospects and separate the bounced and unsubscribed ones?Use it freeReads a Saleshandy prospects CSV: status (Active, Replied, Bounced, Unsubscribed, Finished), outcome (Interested, Meeting booked, Not interested) and verification status (Valid, Risky, Invalid); bounced, unsubscribed and invalid always set aside. - Email and lists
Suppression list merger
How do I combine unsubscribe and bounce lists from different platforms into one?Use it freeTakes any number of suppression files (CSV, Excel, or the Mailchimp audience export .zip) and pasted addresses, labels each address unsubscribed, bounced, spam complaint or suppressed, and merges them with every source named. Optionally removes them, and Gmail dot or +tag versions of them, from a send list.
Export a list from events, forms and communities
Turn an attendee, registrant, guest or member export into an email list: Eventbrite, Zoom, Luma, Whova, Cvent, Calendly, calendar invites, forms, Facebook lead ads, Circle, Mighty Networks, Slack, Patreon and Notion. Each tool finds the email column that platform uses, sets aside cancelled or declined registrations where the export records them, and removes duplicates.
- Email and lists
Eventbrite attendees to email list
How do I get a clean email list from my Eventbrite attendees?Use it freeReads an Eventbrite attendee or orders export (CSV or Excel), one row per ticket, and gives one row per address with tickets, events, ticket types and check-in. Buyer emails can be added; refunded tickets and no-shows can go to a separate file. - Email and lists
Zoom attendee report to email list
How do I get the emails of who attended (and who missed) my Zoom webinar?Use it freeReads a Zoom webinar attendee or registration report, which is several tables in one CSV (Host, Panelist, Attendee, Other Attended), or a meeting participants export. One row per address with attended yes or no, minutes in session added across rejoins, organization and job title. - Email and lists
Webinar registrants to email list
How do I get the emails of people who registered for (or missed) my webinar?Use it freeReads a registrant or attendee report from GoTo Webinar, Webex, Microsoft Teams, Livestorm, WebinarJam or Demio (every table in the file), marks who attended and for how long, leaves out organizers and panelists, reads a marketing opt-in question and merges repeats. - Email and lists
Luma guests to email list
How do I export the emails of everyone who registered for my Luma event?Use it freeReads a Luma guest list CSV (approval_status, checked_in_at, ticket_name), a Meetup attendee download or a RingCentral Events / Hopin registration export. Guests are sorted into going, pending, waitlist, invited or declined, check-ins are counted, and several events pasted together fold into one row per person. - Email and lists
Whova attendees to email list
How do I export my Whova attendee list and turn it into a follow-up email list?Use it freeReads a Whova attendee list (.xlsx or CSV), merges people with several tickets, reads check-in, marks speakers, exhibitors and sponsors from the ticket or category, sets aside opt-outs and keeps affiliation and title. - Email and lists
Cvent attendees to email list
How do I export a Cvent attendee or invitation list and turn it into a clean email list?Use it freeReads a Cvent Invitee Details report or attendee list export, sorts invitee status (accepted, waitlisted or pending, no response or visited, cancelled, declined or denied), reads check-in and registration type, honours an opted-out column and merges repeats. - Email and lists
Calendly invitees to email list
How do I export the email addresses of everyone who booked a call on Calendly?Use it freeReads a Calendly meetings export (or Cal.com and Acuity bookings), one row per booking, and gives one row per invitee with bookings, cancellations, no-shows, event types and the latest date. Guest emails are split out and the host is never included. - Email and lists
Calendar guests to email list
How do I get the email addresses of everyone invited to a calendar event?Use it freeReads an .ics file (every ATTENDEE with its name and RSVP), Google Calendar's guest responses sheet saved as CSV, or a guest list pasted from the invite. Rooms and resources are left out, repeats across events merge, and you keep the responses you tick. - Email and lists
Form responses to email list
How do I get the email addresses out of my Google Form or Typeform responses?Use it freeReads a responses export from Google Forms, Typeform, Jotform, Tally or Microsoft Forms, finds the email question by its answers, merges repeat submissions, reads a consent or newsletter question, and sets test submissions aside. - Email and lists
Facebook lead ads to email list
How do I turn my Facebook lead ads download into a clean email list?Use it freeReads the leads CSV from Meta Business Suite or Ads Manager (UTF-16 tab-separated files included), or a LinkedIn or TikTok lead form export. Strips Meta's l:/c:/p: prefixes, merges repeat leads across forms and campaigns, reads a separate work email question, and sets test leads aside. - Email and lists
Circle members to email list
How do I get an email list of my Circle community members?Use it freeReads the member CSV Circle emails to admins, sorts members by their email marketing preference, sets aside the unsubscribed, merges repeats and keeps name and tags. - Email and lists
Mighty Networks members to email list
How do I export my Mighty Networks members' emails to an email tool?Use it freeReads the member list Mighty Networks emails to hosts (.xlsx or CSV), merges repeated members, keeps names and plans as labels, counts rows with no email and reads a marketing opt-in column if the file has one. - Email and lists
Slack members to email list
How do I get the email addresses of everyone in my Slack workspace?Use it freeReads Slack's Export member list CSV (status, billing-active, userid, fullname), a Microsoft Teams member list or a Google Groups export. Each member is sorted into owner, admin, member, guest or bot, deactivated accounts and bots are set aside, and guests can be split out. - Email and lists
Patreon members to email list
How do I export my Patreon members' email addresses?Use it freeReads Patreon's member CSV (Patron Status, Free Member, Tier, Pledge Amount, Lifetime Amount, Last Charge Status), a Ko-fi supporters download or a Buy Me a Coffee export. Each member is sorted into active paid, declined, free or former; former members are set aside, and tier and lifetime amounts are kept for segmenting. - Email and lists
Notion database to email list
How do I get a list of emails out of a Notion or Airtable database?Use it freeReads a database CSV from Notion (Export > Markdown & CSV), Airtable (Download CSV), ClickUp or monday.com. The email column is found by its values, cells with several addresses or mailto links are split, Notion page links are stripped from names, repeats merge with tags kept, and rows with a ticked Unsubscribed or Do not email box are set aside.
Extract, convert and reshape a file
Get addresses out of a PDF, Word document, spreadsheet, mailbox or contacts file, then shape the CSV the way your next tool wants it: merge, compare several lists, split, segment, sample, sort, split into A/B test groups, split addresses into username and domain, reformat, remove blank rows, find and replace in a column, reorder and rename columns, count unique values, split addresses into street, city, state and zip, standardise countries, states and LinkedIn URLs, fix the encoding, convert JSON to CSV or CSV to an Excel file that keeps leading zeros, or hash it for ad audiences. Everything here runs in your browser, so the file never leaves your device.
- Email and lists
Email extractor
How do I pull the email addresses out of this text?Use it freePaste a thread, a web page's HTML or a messy export, or upload a CSV. Every address is extracted, deduplicated and ready to download. Runs in your browser. - Email and lists
Extract emails from Excel
How do I get the email addresses out of this spreadsheet?Use it freeUpload an Excel, Google Sheets export or CSV file and pull every address from every sheet and cell, deduplicated, with where each was found. Runs in your browser. - Email and lists
Extract emails from PDF
How do I get all the email addresses out of this PDF?Use it freeDrop a PDF to pull every email address from every page, including mailto links, deduplicated with page numbers. The file is read in your browser. - Email and lists
Extract emails from Word
How do I get all the email addresses out of a Word document?Use it freeDrop a Word file to pull every email address from its text, links, headers, footers, footnotes and comments, listed once each and ready to download as CSV. - Email and lists
Email and phone extractor for CSV
How do I get the emails and phone numbers out of a messy CSV?Use it freeEvery cell of every row is searched; each row gets clean email and phone columns, with your original columns kept, plus unique lists of each. In your browser. - Email and lists
Extract domain from email
Which companies are on my email list?Use it freeTurn a list of addresses into its domains: a domain column for each row, unique domains with counts, and company versus free mail. Runs in your browser. - Email and lists
VCF to CSV converter
How do I turn a .vcf contacts file into a spreadsheet?Use it freeReads vCard 2.1, 3.0 and 4.0 exports, including accented names and multiple emails or phones per contact, and writes a CSV for Excel, a CRM or Google Contacts. - Email and lists
MBOX to CSV
Who is in my old Gmail or Thunderbird mailbox?Use it freeDrop an .mbox or .eml export and get every From, To and Cc address with names, message counts and dates, as a CSV. The file never leaves your browser. - Email and lists
EML to CSV converter
How do I export .eml files to Excel or CSV?Use it freeDrop any number of .eml files and get one CSV with a row per message: date, sender, recipients, subject, attachment names and, if you want it, the plain-text body. Nothing is uploaded. - Email and lists
LDIF to CSV converter
How do I convert an LDIF address book to CSV?Use it freeTurns an .ldif file from Thunderbird, macOS Contacts or an LDAP directory into a CSV: one row per person with name, every email and phone, company, title and address; base64 (::) values decoded, folded lines joined, mailing lists counted and skipped. - Domain and sending
EML viewer
How do I open an .eml file without Outlook?Use it freeDrop an .eml file to read it: sender, recipients, date, the HTML and text versions, attachments to download and the raw headers. Remote images stay blocked until you allow them. - Email and lists
CSV merger
How do I combine several CSV exports into one list?Use it freeMerge up to 20 CSVs, match columns by header name even when each export spells them differently, and drop duplicate emails. Runs in your browser. - Email and lists
CSV encoding fixer
Why do names in my CSV show é or ’, and how do I fix them?Use it freeReverses UTF-8 text that was read as Windows-1252 (José to José, O’Brien to O’Brien), re-reads Excel ANSI files as Windows-1252 so accents aren't lost as �, strips zero-width and no-break spaces from addresses, and saves UTF-8 with an optional BOM for Excel. - Email and lists
CSV import formatter
How do I format a lead CSV for Instantly, Smartlead or lemlist?Use it freeUpload any export, match its columns to the fields the sending tool expects, and download a UTF-8, comma-separated file with custom variables named the way that tool writes them. - Email and lists
Email list formatter
How do I turn an Excel column of emails into a list Outlook accepts?Use it freeConverts between one-per-line, comma and semicolon separated lists, strips names, brackets and mailto:, removes duplicates and splits into batches per message. - Email and lists
Email list template
What columns does my email list need before I import it?Use it freeDownload a CSV template with the headers each platform expects, then check your own file for a missing email column, bad header row or the wrong separator. - Email and lists
Split multiple emails in one cell
How do I split several email addresses in one cell into separate rows?Use it freeFinds every address in a cell, whether separated by semicolons, commas, spaces or line breaks, and gives one row per address with the other columns copied, one column per address, or the first address only. - Email and lists
Split full name
How do I split a full name column into first and last names?Use it freeSeparates prefix, first, middle, last, suffix and nickname, reads Last, First order, keeps van and de la with the surname, and flags companies and one-word names. - Email and lists
Country name normalizer
How do I standardise country names or convert them to ISO codes?Use it freeRewrites every spelling of a country (USA, U.S., America, Deutschland, Holland, UK, England) as one form: the English name, the ISO 3166-1 two-letter code or the three-letter code. Reads locations like "Austin, TX, United States" or "Toronto, ON" from the last part, and flags rows it can't read. - Email and lists
State abbreviation converter
How do I convert state names to abbreviations in a list?Use it freeTurns a state or province column into two-letter codes or full names: US states, DC and territories, Canadian provinces and territories, Australian states. Reads AP-style abbreviations (Calif., Mass., N.Y.), uses the row's country column for shared codes like WA, and leaves other countries' regions alone. - Email and lists
LinkedIn URL cleaner
How do I clean LinkedIn profile URLs and remove duplicates?Use it freeRewrites every LinkedIn link as https://www.linkedin.com/in/<name> (or /company/, /school/), removing ?trk= and ?originalSubdomain= tracking, uk. and de. subdomains, trailing /details/ and /recent-activity/ pages and mixed case, marks rows that are the same person, and flags Sales Navigator, post and lnkd.in links that can't be converted. - Email and lists
Email list splitter
How do I split a big email list into smaller files?Use it freeSplit a list or CSV by rows per file or number of files, in order or dealt in turn so each file gets a mix, with the header row and columns in every part. - Email and lists
Email list segmenter
How do I split an email list by domain, provider or country?Use it freeGroups a list or CSV by domain, mailbox provider family, company vs free vs ISP mail, or country-code TLD, with a CSV per segment and every other column kept. In your browser. - Email and lists
Email list sampler
Is this list worth cleaning, or is a spot check enough?Use it freeDraw a seeded random sample (500 rows by default) from a list or CSV, keep every column, and turn the sample's bounce count into a range for the whole list. - Email and lists
Email list by country
How do I find which emails on my list are from the EU or UK?Use it freeGives each address a country hint from its domain ending (.de, .co.uk, .com.br) or a home-country mail provider (web.de, orange.fr, libero.it, seznam.cz), groups them into EU, EEA, UK, Switzerland and rest of world, and marks .com and Gmail as no signal. - Email and lists
Compare email lists
How do I remove my unsubscribes from this list?Use it freePaste a send list and a suppression list and get A minus B, the overlap and the union, matched case-insensitively with your CSV columns kept. Runs in your browser. - Email and lists
SHA-256 email hasher
How do I hash an email list for Customer Match or a Meta audience?Use it freeApplies each platform's normalisation rules (lower case, trimmed, E.164 phones, Gmail dots for Google) then SHA-256, in the browser, with an upload-ready CSV. - Email and lists
Email address masker
How do I hide or mask the email addresses in a spreadsheet before sharing it?Use it freeTurns [email protected] into j******[email protected], ***@example.com, a numbered placeholder or a SHA-256 hash, keeps every other column, and can shorten names to initials and phone numbers to their last two digits. - Email and lists
CSV to Excel (keep leading zeros)
How do I open a CSV in Excel without losing leading zeros?Use it freeScans every column for values Excel changes when it opens a CSV (leading zeros, numbers over 15 digits, 1-2 read as a date, 1E5, a leading +, =, TRUE/FALSE, 1,234) and writes a real .xlsx with those columns stored as text, or every column. Bold, frozen header row; nothing uploaded. - Email and lists
Excel to CSV converter
How do I turn an Excel sheet into a CSV I can import?Use it freeReads every sheet of an .xlsx, .xlsm or .ods file (or cells pasted from Excel), lets you pick one, and writes a UTF-8 CSV with comma, semicolon or tab delimiters. Date cells become YYYY-MM-DD, leading zeros and long IDs are kept, blank rows dropped. Runs in your browser. - Email and lists
CSV VLOOKUP (match two files)
How do I add columns from one CSV to another by matching emails?Use it freePick a main file and a lookup file, match them on email (found automatically) or any column, and copy the columns you choose across. Case and spaces ignored, repeated keys first-wins or combined, rows with no match kept, filtered or listed separately. Runs in your browser. - Email and lists
JSON to CSV
How do I convert a JSON export of contacts to CSV?Use it freeTakes a JSON array, an API response with the records under data, results, items, contacts or similar (picked automatically or by path) or JSON Lines; nested objects become dot-path columns, lists of plain values are joined with ; and lists of objects get numbered columns up to a limit. Email columns are found for the next step. - Email and lists
Remove blank rows from CSV
How do I remove blank rows from a CSV file?Use it freeFinds the three kinds of blank row a spreadsheet export leaves (empty lines, ,,,, lines and space-only lines), optionally N/A and dash placeholders, and rows where a chosen column such as email is empty. Keeps the delimiter and row order; downloads the clean file and a log of what was removed. - Email and lists
Find and replace in CSV
How do I find and replace text in one column of a CSV?Use it freeRuns one or more find-and-replace rules on the columns you tick (all columns if none): plain text or regular expressions with $1 groups, match case and whole-cell options, header row optional. Shows the count per rule and every changed cell; downloads the file and a change log. - Email and lists
CSV column editor
How do I reorder, rename or delete columns in a CSV?Use it freeLists every column with its first value; move it up or down, rename it, delete it or restore it, add a new column with one value for every row, rename all headers to snake_case, Title Case or lower case, and put the email column first. Warns about blank and repeated column names. - Email and lists
Count unique values in CSV
How do I count unique values in a CSV column?Use it freeDistinct count, frequency and share per value for any column, most frequent first; case-insensitive by default with spaces ignored; optional split of multi-value cells on ; , | or line breaks; blank count; case-only variants flagged. Downloads the counts and the distinct list. - Email and lists
Split address into columns
How do I split a full address into street, city, state and zip?Use it freeReads each address from the end: country, postal code (US ZIP and ZIP+4, Canadian, UK, Australian), state or province, then city; unit lines such as Suite 200 or Apt 4B go in their own column. Works with and without commas; rows it had to guess are flagged. Other CSV columns are kept. - Email and listsNew
Email list overlap checker
How much do my email lists overlap?Use it freeCompare up to six lists or CSVs: an overlap count for every pair, addresses on every list or on only one, and a merged deduplicated download with which lists each address came from. - Email and listsNew
Email list sorter
How do I sort an email list by domain?Use it freeSort addresses or a whole CSV by domain, mailbox provider, domain ending (.de, .co.uk) or address, in either direction, with the rows' other columns kept and a group column added. - Email and listsNew
Email list A/B splitter
How do I split my email list randomly for an A/B test?Use it freeDeal a list or CSV into 2 to 5 random test groups plus an optional holdout, with Gmail, Outlook and company addresses spread evenly and the same inbox kept in one group. - Email and lists
Email address splitter
How do I split an email address into username and domain?Use it freeAdds username, username without the +tag, the tag, domain, subdomain, registrable domain (acme.co.uk) and domain ending columns to every row of a list or CSV.
Find an email address or company domain
Work out a person's likely work address from their name and company domain, find the pattern a company uses, pull published addresses from a website, match company names to domains and back, turn a website column into clean domains, or check that each address on a lead list fits the contact's name. Guessed addresses are only candidates: check the top ones with a live mailbox check before you send.
- Email and lists
Email permutator
What is this person's work email address?Use it freeName plus company domain to every likely format, ranked by how common it is, then a live check of the top 8. - Email and lists
Bulk email permutator
How do I generate email guesses for a whole list of names?Use it freeUpload names and domains and get the likely address formats for every row, most common first, as a CSV ready to verify. Runs in your browser. - Email and lists
Email format finder
What is this company's email format?Use it freeReads a few name and address pairs, tells you which of 14 common formats fits, then builds addresses for other names at the same domain, or every common pattern when you know none. Guesses, flagged unverified. In your browser. - Email and lists
Website email extractor
How do I find the email address on a website?Use it freeEnter a website. Its page and up to four linked contact, about or team pages are read, where robots.txt allows, and every published address is listed with its page. - Email and lists
Name from email
How do I get first names from a list of emails?Use it freeBulk-guess first and last names from address patterns like john.smith@, with a confidence for each and role addresses left blank, ready for a mail merge. - Domain and sending
Company name to domain finder
What is the website domain of each company on my list?Use it freePaste company names and get the likely domain for each, with high, medium or low confidence and the reason, from Wikidata and a check of the home page. - Domain and sending
Domain to company name lookup
Which company is behind each of these domains?Use it freePaste domains or work email addresses and get the company or site name for each, with high, medium or low confidence, the source and the mail server. - Email and lists
Extract domain from URL
How do I turn a website column into clean domains?Use it freeTurns https://www.example.com/about?utm=x, example.com/contact or an email address into example.com in bulk, with the root domain for subdomains (read from the Public Suffix List, so co.uk and com.au work), and flags rows that have no company domain: social profiles, link-in-bio pages, Shopify, Wix and other hosted subdomains, IPs and names. - Email and listsNew
Email and name match checker
Which emails on my lead list don't belong to the person named?Use it freeCompares each row's address with its first and last name: full match, first name only, last name only, initials, role inbox or no match, with the pattern found. Catches enrichment mix-ups before a send.
Before you send
Check a campaign the hour before it goes out: spam-trigger words, subject and preview text, broken links, image-to-text ratio, message size, HTML that breaks in Outlook, accessibility, merge fields and how full each column is, first names, company names and job titles, personalised first lines, merge tags moved between tools, lead scores, CAN-SPAM basics and the footer, how many contacts per company you are about to email, and how to publish your own address on a site without it being scraped. After a bad send, find the source that bounced, the addresses that keep soft-bouncing and the complainants in your feedback-loop reports before the next one. Each check runs on your own copy or list and says what to change.
- Domain and sending
Spam words checker
Will words in my email send it to spam?Use it freePaste email copy to see which phrases match published SpamAssassin rules or break Google's sender guidelines, and which flags are only common advice. Runs in your browser. - Domain and sending
Subject line tester
Will my subject line get cut off or flagged?Use it freePreview a subject line and preheader in Apple Mail, the Gmail app and Gmail on desktop, and check it against published filter rules and Google's guidelines. - Domain and sending
Cold email subject line generator
What subject line should my cold email use?Use it freeTurns your topic, outcome and trigger into five styles of subject line, each checked against spam-filter rules and phone width. - Domain and sending
Cold email template generator
How should my cold email read?Use it freeFill in your offer once and get three drafts (trigger-led, quick question, problem-agitate-solve and more) with subject lines. Templates, not AI. - Domain and sending
Spintax checker
Is my spintax valid, and how many versions does it make?Use it freeChecks {a|b} and {{RANDOM | a | b}} syntax with line and column for every error, counts the variations and shows random renders. Merge fields are left alone. - Email and lists
Mail merge field checker
Which rows of my list would send a broken mail merge?Use it freeReads the {{first_name}}, {FirstName} and *|FNAME|* tags in your template, matches each to a CSV column, and lists every row where a tag would render blank or as a placeholder like n/a, plus tags with no column and unclosed braces. - Domain and sending
Merge tag converter
How do I convert merge tags from one email tool to another?Use it freeRewrites the personalization tags in a template for Instantly, Smartlead, lemlist, Mailchimp, HubSpot, Brevo, Klaviyo or a Google Sheets mail merge: standard fields to the tool's own names, other fields as custom variables, fallbacks kept where the tool's syntax has one, spintax and unsubscribe tags left alone. - Domain and sending
Personalization line builder
How do I write a personalised first line for every row of a CSV?Use it freeBuilds a new column from up to five if-then rules and a default line: "if title contains founder", "if recent_post is filled", "if industry is SaaS". Each line uses {{column}} tags from your CSV, and a rule only fires when every field it uses has a value, so no row gets "Saw is hiring". Templates and rules, not AI. - Email and lists
CSV fill rate checker
How do I find missing values in every column of a CSV?Use it freeCounts filled, blank and placeholder cells (n/a, -, null, #N/A, test) in every column, with distinct and most common values, and marks each column safe as a merge field (98%+ filled), needing a fallback, too empty to personalise with, or the same value everywhere. Download the report or the rows with gaps. - Email and lists
First name cleaner
How do I clean up first names before personalising a cold email?Use it freeFixes JANE and jane to Jane, strips Dr., emoji and (she/her), and replaces blanks, initials, placeholders like test or n/a and company names with a fallback such as "there", or a name read from the email address. - Email and lists
Company name cleaner
How do I clean company names for a mail merge?Use it freeRemoves legal suffixes (Inc., LLC, Ltd, GmbH, Pty Ltd, S.A. and dozens more), taglines after a | or dash, bracketed notes and trademark signs, fixes ALL CAPS while keeping short acronyms like IBM, leaves deliberate casing like eBay alone, and swaps blanks, n/a, self-employed and stealth for a fallback. - Email and lists
Job title normalizer
How do I standardise job titles in a lead list?Use it freeRewrites every spelling of a role into one form (VP of Sales or Vice President of Sales, CEO or Chief Executive Officer), spells out Sr., Mgr, Mktg and Exec, removes the company after " at " or "@", extra roles after a "|", emoji and bracketed notes, and fixes ALL CAPS while keeping acronyms like HR and SEO. - Domain and sending
Inbox preview: subject and preview text
How will my subject and preview text look in the inbox?Use it freeSimulated Gmail, Outlook and iPhone inbox rows show where the subject and preheader get cut, and what an email's HTML puts in the preview. - Domain and sending
Email size checker
Will Gmail clip my email?Use it freeMeasures the HTML in KB against Gmail's roughly 102 KB clipping point, breaks down what makes it heavy, and gives you a minified copy. - Domain and sending
HTML email checker
Will my HTML email break in Gmail or Outlook?Use it freeReads the HTML you paste and flags what the big clients drop or mangle: scripts, forms, external stylesheets, flexbox and grid, CSS variables, SVG and WebP images, base64 images, relative image paths, unclosed table tags, missing doctype or charset, and size past Gmail's 102 KB clip. - Domain and sending
Email CSS inliner
How do I inline the CSS in my HTML email?Use it freeWrites each <style> rule into the style attribute of every element it matches, in cascade order (specificity, source order, !important), keeps existing inline styles, leaves media queries, @font-face and :hover rules in the head, and can copy pixel widths to width attributes for Outlook. - Domain and sending
Email accessibility checker
Can a screen reader user read my email?Use it freeChecks a pasted HTML email against the WCAG basics that apply to email: a lang attribute, layout tables marked role="presentation", alt text that isn't a file name, links that say where they go, heading order, text under 14px and inline colour contrast below 4.5:1. - Domain and sending
HTML to plain text email converter
What should the plain-text part of my email say?Use it freePaste HTML email source and get a readable text/plain alternative: headings, lists and links kept, pixels and hidden preheaders dropped, lines wrapped at 78. - Domain and sending
Email link checker
Are the links in my email going to hurt deliverability?Use it freeLists every link in a pasted email with its text and target, and flags URL shorteners, text that shows one domain but links to another, empty or # links, relative links, bare IP addresses and plain http, plus every domain the email links to. - Domain and sending
Email image to text ratio checker
Does my email have too many images and not enough text?Use it freeCounts the images in a pasted email against its visible text in bytes and words, names the SpamAssassin HTML_IMAGE_ONLY band it falls in (under 3,200 bytes of text with images), and flags missing alt text, base64 and http images, tracking pixels and hidden text. - Domain and sending
CAN-SPAM compliance checker
Does my email footer meet CAN-SPAM?Use it freeChecks a pasted email for an unsubscribe link or merge tag (or a reply-only opt-out), a physical postal address (street, P.O. box or postcode), a subject without a fake Re: or Fwd:, a From name that identifies you and CASL's contact-method rule; the rules it can't read from text are listed for you to confirm. - Domain and sending
Email footer generator
What should my email footer say?Use it freeBuilds a footer from your business name, postal address, an unsubscribe URL or your platform's merge tag (Mailchimp, HubSpot, ActiveCampaign, SendGrid), an optional preferences link, reason line, contact address and ad notice, as table-based HTML and plain text, then runs it through the CAN-SPAM checks. - Domain and sending
Email deliverability checklist
Have I covered everything that decides whether my email reaches the inbox?Use it free18 items across authentication, reputation, list hygiene, volume, content and unsubscribe, each tied to Google, Yahoo, Microsoft or the law. Five run as live checks on your domain; the rest you tick off. - Domain and sending
Send schedule planner
How do I spread my email list over days and inboxes so I stay under the sending limits?Use it freeTakes your list, your sender inboxes and a daily cap per inbox (with an optional warm-up ramp), and gives every row a send date and a sender, skipping weekends and holding back extra contacts at the same company to another day. - Calculators
Cold email follow-up planner
How many new contacts a day can I start once my follow-ups are running?Use it freeEnter your inboxes, the daily cap per inbox and the days between steps. See the most new contacts a day that fit once every follow-up is running, the day the load peaks and a day-by-day table of sends per step and per inbox. - Email and lists
Limit contacts per company
How do I keep only 2 or 3 contacts per company in my lead list?Use it freeGroups your list by company domain, keeps the first N per company (ranked by job title keywords such as founder, CEO or VP when there's a title column) and sets the rest aside, with a count of rows per domain. - Email and lists
Job title seniority filter
How do I keep only the decision-makers in my lead list?Use it freeReads the job title column and gives every row a seniority level (owner or founder, C-level, VP, director or head, manager, senior IC, IC, intern) and a department, then splits the list by the levels you tick. Sr., Mgr, SVP and VP spellings are understood. - Email and lists
Lead scoring tool
How do I score a lead list before a cold email campaign?Use it freeGives every row a score from rules you set: seniority read from the title (founder, C-level, VP, director, manager...), target departments, title keywords, excluded words, company vs free webmail, role addresses like info@, and target countries. Grades A to D, sorted highest first, with every point listed per row. - Email and lists
Inactive subscriber finder
How do I find inactive subscribers in my email list?Use it freeReads the last open, last click or last activity dates in a Mailchimp, Klaviyo, Kit or other export, and sorts every subscriber into active, cooling off, inactive, never engaged, or new with no activity yet, with one CSV per group. - Email and lists
Bounce rate by list source
Which lead source or list caused my bounce spike?Use it freeReads a send or activity export (one row per recipient with a status column) and splits hard bounces, soft bounces, blocks, complaints and unsubscribes by any column (lead source, list, tag, campaign, import date) or by the recipient's mailbox provider. Flags groups at 2% hard bounces or 0.1% complaints; downloads the breakdown and the rows of flagged groups. - Email and lists
Repeat soft bounce finder
When should I remove an address that keeps soft bouncing?Use it freeCounts, per address, the distinct sends (by date or campaign) with a soft bounce (4.x.x, mailbox full, deferred, timed out). Addresses over your threshold with no delivery since go on a suppression list; ones that delivered after their last soft bounce are marked recovered; hard bounces are listed too. - Email and lists
Feedback loop report parser
How do I read feedback loop complaint reports in bulk?Use it freeReads pasted ARF reports (RFC 5965: Feedback-Type, User-Agent, Source-IP, Original-Rcpt-To and the reported message) and Amazon SES complaint notification JSON. Lists each complaint, counts redacted recipients, groups by subject, Feedback-ID, sending IP and up to five headers of yours, and builds a suppression list. - Domain and sending
Spam trap risk checker
How likely am I to hit spam traps?Use it freeNine questions about where your list came from and how you maintain it give an exposure level and a fix for each risky habit. A self-assessment: no tool can name which addresses are traps. - Domain and sending
UTM builder
How do I add UTM parameters to the links in my emails?Use it freePaste a URL, pick an email or SMS preset and get a tagged link that GA4 counts in the right channel. Tag hundreds of URLs at once and download them as a CSV. - Domain and sending
Mailto link generator
How do I make a mailto link with a subject and body?Use it freeType the address, subject and message and copy a mailto: link that opens a ready-to-send draft, as a plain link, HTML or Markdown. Spaces and line breaks are encoded the way RFC 6068 asks. - Domain and sending
Email obfuscator
How do I put my email address on a website without getting spam?Use it freeFive copy-paste snippets for one address, optional link text and subject: split address with the mailto set on hover, focus or tap; link built by JavaScript with an [at] [dot] fallback; HTML-entity mailto; written-out text; CSS-reversed text. Each says what it stops and what it costs visitors. - Domain and sending
Email signature generator
How do I make a professional email signature for Gmail or Outlook?Use it freeFill in your details, pick a layout and colour, and copy a table-based HTML signature that pastes cleanly into Gmail, Outlook and Apple Mail.
DNS, authentication and sender setup
Check and build the records mailbox providers read before they accept your mail: SPF, DKIM, DMARC, MX, BIMI, MTA-STS and reverse DNS, plus blocklists, the Gmail, Yahoo and Microsoft bulk sender rules and a Feedback-ID header for per-campaign spam rates. If a message already failed, start from the evidence with the header analyzer or the bounce tools; if the account was suspended, write the reply with the appeal builder.
- Email and lists
Email header analyzer
Why did this email fail or land in spam?Use it freePaste raw headers to see SPF, DKIM and DMARC results, alignment, every hop with its delay and TLS, and spam filter verdicts. Runs in your browser. - Domain and sending
Deliverability audit
Can this domain send and receive mail?Use it freeMX, SPF, DKIM, DMARC and blocklist status for any domain, with what each result means for mail sent to or from it. - Generators
SPF record generator
Build a valid SPF record from your actual providers, with a live count against SPF's ten-lookup limit.Use it free - Generators
DMARC record generator
Build a DMARC record with the right policy and reporting address — and it says plainly when p=none enforces nothing.Use it free - Record checks
MX record lookup
An MX lookup returns the mail servers that accept email for a domain, each with a priority number where lower is tried first.Use it free - Record checks
SPF record checker
An SPF checker reads a domain's SPF TXT record and reports which servers it authorises to send mail and what should happen to everything else.Use it free - Record checks
DMARC record checker
A DMARC checker reads the TXT record at `_dmarc.yourdomain.com` and reports the policy it publishes: none, quarantine or reject.Use it free - Record checks
DKIM checker
A DKIM checker looks up the public key a domain publishes at `selector._domainkey.domain` and tests whether it is usable.Use it free - Record checks
Domain blacklist check
A domain blacklist checker looks your domain up on the blocklists spam filters use to judge the domains in a message: the From address and every link.Use it free - Domain and sending
Gmail & Yahoo bulk sender checker
Does my domain meet Gmail's and Yahoo's bulk sender rules?Use it freeOne domain in, a checklist out: SPF, DKIM, DMARC, PTR and MX from live DNS, plus one-click unsubscribe, alignment and spam rate as manual items. - Domain and sending
Reverse DNS lookup
Does this mail server IP have valid reverse DNS?Use it freeEnter an IPv4 or IPv6 address to get its PTR hostname, plus the forward-confirm check that Gmail and Yahoo require on sending IPs. - Domain and sending
Bounce message analyzer
What does this bounce message mean?Use it freePaste an Undeliverable or Delivery Status Notification email and get the code, hard or soft, the likely cause and the fix. Runs in your browser. - Domain and sending
IP blacklist check
Is my sending IP on a blacklist?Use it freeCheck an IPv4 address against Spamhaus ZEN, Barracuda, SpamCop, PSBL and Mailspike, with each listing code explained and unreachable lists reported honestly. - Domain and sending
BIMI checker
Is my BIMI logo set up correctly?Use it freeCheck a domain's BIMI record, SVG Tiny PS logo, VMC or CMC certificate and DMARC policy against Google's and the BIMI Group's published requirements. - Domain and sending
DKIM key generator
How do I generate a DKIM key and DNS record?Use it freeCreate a 2048-bit DKIM key pair and the selector._domainkey TXT record in your browser. The private key never leaves the page. - Domain and sending
Microsoft sender requirements checker
Does my domain meet Outlook's 5,000-a-day sender rules?Use it freeCheck SPF, DKIM and DMARC against Microsoft's high-volume sender requirements for Outlook.com, Hotmail and Live, with its recommendations listed separately. - Domain and sending
Microsoft 365 SMTP AUTH cut-off checker
Will my Microsoft 365 inboxes stop sending in December?Use it freePaste sending domains and see which run on Microsoft 365, whether SPF, DKIM and DMARC are set up for it, and what to switch to OAuth before the end of December 2026. - Domain and sending
List-Unsubscribe header generator
What List-Unsubscribe headers do Gmail and Yahoo need?Use it freeBuilds the two one-click unsubscribe headers from your URL, and checks pasted headers for HTTPS, the exact Post value, a recipient token and DKIM coverage. - Domain and sending
DNS lookup
What DNS records does this domain have?Use it freeA, AAAA, CNAME, MX, NS, TXT, SOA and CAA in one lookup, with the email records (MX, SPF, DMARC) summarised and linked to the in-depth checkers. - Domain and sending
TXT record lookup
What TXT records does this domain have, and what are they for?Use it freeShows TXT records on the domain and on _dmarc, default._bimi, _mta-sts and _smtp._tls, labels SPF, DKIM, DMARC and verification tokens, and flags duplicates. - Domain and sending
DMARC report analyzer
What do my DMARC reports say?Use it freeTurns rua XML attachments from Google, Microsoft and Yahoo into a table of sending IPs, pass rates and unaligned senders. Unzipped in your browser. - Domain and sending
CNAME lookup
Is my custom tracking domain set up right?Use it freeFollows the CNAME chain, checks the target against Instantly, Smartlead or lemlist, catches the doubled-domain and proxied-record mistakes, and tests HTTPS. - Domain and sending
SPF lookup counter
Is my SPF record over the 10-lookup limit?Use it freeExpands every include and redirect, counts DNS lookups and void lookups against RFC 7208's limits, and shows which include uses the most. - Domain and sending
DKIM signature validator
Does this email's DKIM signature actually verify?Use it freePaste a raw message to recompute the body hash and check the signature against the published key, with the reason when it fails. - Domain and sending
BIMI record generator
What should my BIMI record say?Use it freeBuild the BIMI TXT record from your logo and certificate URLs, get the host name to publish it at, and check DMARC is at enforcement first. - Domain and sending
MTA-STS checker
Is my MTA-STS policy set up right?Use it freeReads the _mta-sts and TLS-RPT records, fetches the policy file over HTTPS the way a sending server does, and checks every MX host against it. - Domain and sending
SMTP settings lookup
What are the SMTP settings for my email address?Use it freeDetects who hosts a domain's mail from its MX records and shows that provider's SMTP, IMAP and POP settings, each from the provider's own docs. - Domain and sending
DNS propagation checker
Has my DNS change reached Google, Cloudflare, Quad9 and the rest yet?Use it freeAsks 12 public DNS-over-HTTPS resolvers and the zone's own name server for one record, shows each answer as it came back, and how long each cache keeps an old one. - Domain and sending
SPF flattener
How do I get my SPF record under 10 DNS lookups by flattening it?Use it freeResolves every include, a and mx in an SPF record to the ip4 and ip6 ranges behind them, outputs the flattened record (split into sub-records when it's too long) and warns that it goes stale. - Domain and sending
MX records generator
Which DNS records does my mail provider need, exactly as my DNS host wants them?Use it freePick Google Workspace, Microsoft 365, Zoho, Fastmail or iCloud+ and a DNS host; get the MX, SPF, DKIM and DMARC records from the provider's own guide, ready to paste. - Domain and sending
TLS-RPT record checker
Is my TLS-RPT record valid, and can reports actually reach me?Use it freeEnter a domain to read its _smtp._tls TXT record, validate it against RFC 8460 (case-sensitive tags, one record only) and check that every mailto: or https: destination can receive reports. - Domain and sending
BIMI SVG validator and converter
Is my SVG logo valid for BIMI, and how do I convert it to SVG Tiny PS?Use it freePaste or upload an SVG to check it against the SVG Tiny PS profile and Gmail's requirements, then download a converted copy with before and after previews. Runs in your browser. - Domain and sending
Bulk SPF, DKIM and DMARC checker
Do all of these domains have SPF, DKIM and DMARC set up?Use it freePaste a list of domains and see, for each one, whether SPF, DKIM, DMARC and MX are published, with a pass, warn or fail and the reason in plain English. - Domain and sending
Bulk DNS lookup
What DNS records do all of these domains have?Use it freePaste a list of domains or host names and get their A, AAAA, MX, TXT, NS and CNAME records side by side, in one table and one CSV. - Domain and sending
Email spoofing test
Can someone send email pretending to be my domain?Use it freeEnter a domain, or a list, and get a plain yes, partly or no from its DMARC and SPF records, with what to change to stop forged mail. - Domain and sending
DKIM selector finder
What is my DKIM selector?Use it freeEnter a domain and see which of about 80 known DKIM selectors it publishes, with each key's length and the sending platform where DNS shows it. - Domain and sending
Bulk nameserver lookup
Who hosts DNS for these domains?Use it freePaste domains and get each one's NS records with the company that runs them (Cloudflare, Route 53, GoDaddy, Namecheap and about 40 others), plus parked domains, in one table. - Domain and sending
Cold email domain finder
What secondary domains can I register for cold email?Use it freeEnter your main domain, such as acme.com, and get lookalike sending-domain ideas like getacme.com, tryacme.com, acmehq.com and acme.io, each checked against the registry for likely availability, plus the SPF, DKIM and DMARC setup checklist. - Domain and sending
Cold email domain checker
Is my new domain ready for cold email?Use it freePaste the domains you just bought and get a pass/fix checklist for each: mailbox provider, MX, SPF (with the 10-lookup count), DKIM, DMARC, age and website, plus copyable records for Google Workspace, Microsoft 365 or Zoho. - Domain and sending
Domain email setup checker
Is email on my new domain set up right?Use it freePaste the domain you just bought, or up to 25, and get a pass/fix checklist for MX, SPF, DKIM and DMARC with the mailbox provider named and the exact records to copy for Google Workspace, Microsoft 365 or Zoho. - Domain and sending
Professional email address generator
What should my business email address be?Use it freeEnter your name and your new domain to get professional address ideas (first@, first.last@, hello@, support@) with the reason to pick each, plus the postmaster@ and DMARC aliases worth creating. - Domain and sending
SPF record merger
My domain has two SPF records. How do I merge them?Use it freePaste your SPF records or enter a domain and get one merged record with duplicates removed, one ending, the DNS lookup count and 255-character strings ready to publish. - Domain and sending
Email forwarding checker
Is email forwarding working on my new domain?Use it freeEnter a domain, or up to 25, and see from its MX records whether mail goes to a forwarding service, a mailbox provider or nowhere, with the SPF include and DMARC it needs. - Domain and sending
MTA-STS generator
How do I create an MTA-STS policy and DNS record?Use it freeEnter your domain, pull in your MX hosts and pick a mode to get the mta-sts.txt policy file, the _mta-sts TXT record and a matching TLS-RPT record, checked against RFC 8461. - Domain and sending
Bulk SPF lookup counter
Which of my domains are over the SPF 10-lookup limit?Use it freePaste domains and see, for each, how many DNS lookups its SPF record costs out of 10, the includes that cost the most, void lookups and faults that make SPF fail. - Domain and sendingNew
Bulk SOA record lookup
What are the SOA serial and timers for these domains?Use it freePaste domains and get each zone's SOA record: primary name server, hostmaster address, serial (and whether it reads as a date), refresh, retry, expire and the negative-caching TTL, with timers outside the RFC 1912 and RFC 2308 suggestions flagged. - Domain and sending
Email domain health checker
Is my domain's email setup healthy, and what should I fix first?Use it freeRuns MX, SPF (with the 10-lookup count), DKIM, DMARC, MTA-STS, TLS-RPT, BIMI and blocklist checks on one domain and returns a score out of 100 with the fixes in the order to make them. - Domain and sending
Bounce Doctor
Are my bounces bad addresses, or is my sending being blocked?Use it freeSorts every bounce in a pasted batch of NDRs or a CSV export into bad address, missing domain, sender block, security gateway or temporary, explains each code in plain English and builds suppress, retry and review files. - Domain and sending
Feedback-ID header generator
How do I set up a Feedback-ID header for Gmail?Use it freeBuilds `Feedback-ID: a:b:c:SenderId` from up to three identifiers (campaign, customer, mail type) and a SenderId, or reads one you already send, and checks it against Google's rules: SenderId 5-15 characters, colons only as separators, identifiers not repeated across fields, no per-message values such as addresses or UUIDs. - Domain and sending
ESP suspension appeal builder
What do I write to get my email account reinstated?Use it freeBuilds a plain reply to an ESP account review or suspension from what you tick: the cause, where contacts come from, changes already made, numbers removed and remaining, and how they prevent a repeat. Follows the structure Amazon SES, HubSpot and Mailgun publish, warns about purchased lists and planned-not-done steps, and says where each platform takes the reply. - Domain and sending
Bulk DNS records for cold email domains
What DNS records do all my new cold email domains need, in one go?Use it freePaste your sending domains, pick Google Workspace or Microsoft 365 and your DNS host, and get MX, SPF, DKIM, DMARC and an optional Instantly, Smartlead or lemlist tracking CNAME for every domain, as one CSV or zone-file lines. - Domain and sending
Custom tracking domain generator
What CNAME record does my sending tool need for a custom tracking domain?Use it freePick Instantly, Smartlead, lemlist or another tool and paste your sending domains. Get the CNAME host and target from the tool's own help article for each domain, formatted for your DNS host, plus the exact value to paste back into the tool. - Domain and sending
HELO hostname checker
Does my mail server's HELO name match its PTR and A record?Use it freeEnter the HELO/EHLO name (or paste a Received header) and the sending IP: checks the name is a real FQDN, has an A record pointing at the IP, the IP's PTR resolves back, and the PTR matches the HELO, as Spamhaus's sender guidelines ask. - Domain and sending
Bulk mailbox CSV generator
How do I create many cold email inboxes at once in Google Workspace or Microsoft 365?Use it freeTakes your sending domains, the sender names and the address formats you want (jane@, jane.doe@…), and writes one row per mailbox in the CSV format each admin console's bulk upload takes, with random passwords for Google made in your browser. - Domain and sending
DMARC alignment checker
Why does DMARC fail when SPF and DKIM pass?Use it freeCompares the From domain with the SPF (Return-Path) and DKIM (d=) domains under relaxed or strict alignment, and shows whether the message passes DMARC. Paste headers to fill it in. Runs in your browser.
Domain and provider lookups
Look up who a domain belongs to and what it runs on: whether it is free to register, how old it is, when it expires, what its status codes mean, its registrar, web host and status, whether it has DNSSEC, CAA and IPv6, its security headers, robots.txt, sitemap, favicon, security.txt, ads.txt and llms.txt, whether www and HTTPS redirect to one address, who runs its extension, how an internationalised name is written in Punycode, which mailbox provider and email tools it uses, and look-alike domains that could be used to spoof it. Most run in bulk on a pasted list of domains.
- Domain and sendingMost used
Bulk domain availability checker
Which of these domain names are still available?Use it freePaste up to 100 domains (500 when signed in), or bare names to try across .com, .io and other TLDs, and see which are registered and which look available, straight from each registry's RDAP server. - Domain and sendingMost used
Domain age checker
How old is this domain?Use it freeRegistration date, age, expiry and registrar for up to 10 domains, read from each registry's RDAP server, with honest gaps where a registry publishes nothing. - Domain and sendingMost used
Bulk domain age checker
Which domains on my list were registered recently?Use it freePaste or upload a list of domains or emails and get each domain's creation date, age and registrar from RDAP, sorted, filtered by age and downloadable. - Domain and sending
Bulk domain expiry checker
Which of my domains expire soon?Use it freePaste or upload a list of domains and get each one's expiry date, days left and registrar from RDAP, grouped into expired or in grace, under 30 days, 30–90 days and 90+ days. - Domain and sending
Domain drop date calculator
When will this expired domain become available?Use it freeEnter a domain or a list. Each one's registry status and expiry date give its phase and the window in which it could be deleted and released. - Domain and sending
Available domain name generator
What's a good domain name that's still available?Use it freeEnter up to three keywords and pick TLDs: name ideas from prefixes, suffixes and keyword joins are checked against each registry's RDAP server and DNS, likely-available first. - Domain and sending
Domain extension checker
Which extensions are still free for this name?Use it freeType one name and check it across up to 52 extensions in five groups (popular, tech, business, brand and country), with each registry's answer: likely available, registered or unknown. - Domain and sending
Domain hack generator
Can this word be spelled as a domain, like delicio.us?Use it freeEnter words or a brand name and see every way the word's ending can be a domain extension (market.ing, brew.ing, delicio.us), each checked against its registry: likely available, registered or unknown. - Domain and sending
Domain transfer checker
Can I transfer this domain to another registrar yet?Use it freePaste domains and see which can move to another registrar now, which need the registrar lock turned off, which are inside the 60-day window (with the date it ends) and which are blocked by the registry. - Domain and sending
Domain status code checker
What do this domain's status codes, like clientHold or clientTransferProhibited, mean?Use it freePaste domains and get every EPP status code in each registry record, explained: who set it, what it does, and what to do, with each domain read as Normal, Needs a look, On hold or Being deleted. - Domain and sending
WHOIS lookup
Who registered this domain, and when?Use it freeRegistrar, creation and expiry dates, EPP status, name servers and DNSSEC from the registry's own RDAP server, with contact records hidden until you ask. - Domain and sending
Bulk WHOIS lookup
What do the WHOIS records say for all of these domains?Use it freePaste or upload domains and get registrar, created, updated and expiry dates, EPP status codes, nameservers and DNSSEC for each, from the registry's RDAP server, in one table. - Domain and sending
Domain registrar lookup
Where is my domain registered, and where do I add DNS records?Use it freeEnter a domain or a list and get each one's registrar and expiry from the registry, the company that runs its DNS (where records are edited) and its email provider. - Domain and sending
Website host checker
Who hosts this website, and who runs its email?Use it freePaste one website or a list and see which platform serves each one, the DNS record or header that says so, plus the company running its DNS and its email. - Domain and sending
Bulk website status and parked domain checker
Which of these websites are live, redirecting or parked?Use it freePaste a list of domains and see each one's HTTP status, where it redirects, and whether it looks parked or for sale, with the signal that says so. - Domain and sending
Bulk SSL certificate checker
When do the SSL certificates on these sites expire?Use it freePaste domains or host names and get each one's TLS certificate: days left, expiry date, issuer, the names it covers, and whether it's expired, for the wrong name or not trusted. - Domain and sending
DNSSEC checker
Is DNSSEC on for this domain, and is it working?Use it freePaste one domain or a list and see which are signed and validate, which are broken (validating resolvers refuse them), which have keys but no DS at the registry, and which aren't signed. - Domain and sending
CAA record checker
Which certificate authorities are allowed to issue SSL certificates for this domain?Use it freePaste domains or host names and see, for each, the CAA record a CA would use (its own or a parent's), the CAs allowed for ordinary and wildcard certificates, and where refusals are reported. - Domain and sending
IPv6 checker
Is this domain IPv6 ready?Use it freePaste domains and see, for each, whether the website (the domain and www), the MX mail servers and the name servers publish IPv6 addresses: IPv6 ready, Partly or IPv4 only. - Domain and sending
Security headers checker
Which security headers does this website send?Use it freePaste websites and see, for each home page, whether Strict-Transport-Security, Content-Security-Policy, clickjacking protection and nosniff are set, and which are weak. - Domain and sending
Robots.txt checker
Does this site's robots.txt block Google or AI crawlers?Use it freePaste websites and see, for each, whether robots.txt lets Googlebot, Bingbot and the main AI crawlers (GPTBot, ClaudeBot, PerplexityBot, CCBot...) fetch the home page, plus its Sitemap lines. - Domain and sending
Sitemap checker
Does this site have a working sitemap?Use it freePaste websites and see, for each, where its sitemap is (robots.txt or /sitemap.xml), whether it's a sitemap or an index, how many URLs it lists and whether it's over the limits. - Domain and sending
Favicon checker
Does this website have a working favicon?Use it freePaste websites and see, for each, the favicon and Apple touch icon its home page declares (or /favicon.ico), whether each loads as an image, and its format and size. - Domain and sending
Punycode converter
What is this domain in Punycode, or in Unicode?Use it freePaste domains with accents or non-Latin letters, or xn-- names, and get both forms, the length DNS sees, and warnings for invalid characters and mixed scripts. - Domain and sendingNew
Security.txt checker
Does this site have a valid security.txt file?Use it freePaste websites and see, for each, whether /.well-known/security.txt exists, has the required Contact and Expires fields, hasn't expired and follows RFC 9116, with every contact listed. - Domain and sendingNew
Ads.txt checker
Is this site's ads.txt valid, and which ad systems does it list?Use it freePaste publisher domains and see, for each, whether /ads.txt exists, how many DIRECT and RESELLER records it has, which ad systems it names, its OWNERDOMAIN and MANAGERDOMAIN, and every line a buyer's crawler will skip. - Domain and sendingNew
Llms.txt checker
Does this site have an llms.txt, and is it in the right format?Use it freePaste websites and see, for each, whether /llms.txt exists, whether it's Markdown with the H1, blockquote summary and linked H2 sections the llmstxt.org proposal describes, how many links it lists, and whether /llms-full.txt exists. - Domain and sendingNew
WWW redirect checker
Do the www and non-www versions of this site redirect to one HTTPS address?Use it freePaste domains and see, for each, where http://, https://, http://www. and https://www. end up, the redirect codes on the way, and whether the site is Consistent, uses temporary redirects, has one version that fails, is split into two copies, or doesn't send visitors to HTTPS. - Domain and sendingNew
TLD registry lookup
Who runs this domain extension, and can its domains be looked up with RDAP?Use it freePaste extensions, domains or URLs and see, for each top-level domain, its sponsoring organisation and technical contact's organisation from IANA's root zone records, when it entered the root, whether it's DNSSEC-signed, and whether its registry offers RDAP for domain lookups. - Domain and sending
Lookalike domain checker
Has anyone registered a lookalike of my domain?Use it freeEnter your domain to generate up to 150 typo, homoglyph, Unicode and TLD variants and see which are registered, which answer on the web and which have MX records to send or receive email. - Domain and sendingMost used
Email provider lookup
Is this company on Google Workspace or Microsoft 365?Use it freeEnter a domain or address and see its mail provider and any security gateway (Proofpoint, Mimecast, Barracuda), read from MX and SPF records. - Domain and sending
Bulk MX / provider lookup
Which of my contacts are on Google and which on Microsoft?Use it freeUpload a CSV of emails or domains, get each row's mail provider from MX and SPF, and download the list split into Google, Microsoft and other. - Domain and sending
Email stack lookup
Which email marketing platform does this company use?Use it freePaste company domains and see each one's mailbox provider, sending platforms, security gateway, DMARC reporting and verified SaaS, with the DNS record behind each. - Domain and sending
Which ESP sent this email?
What platform sent this email?Use it freePaste the raw headers of any email and see the platform that sent it, such as SendGrid, Mailchimp or Amazon SES, with the DKIM, bounce and Received lines behind it. - Domain and sending
Is Gmail down?
Is Gmail down, or is it just me?Use it freeReads Google's own status feed for open Gmail incidents and connects to Gmail's mail servers to read their greeting, with the time of each check. Outlook.com too, from Microsoft's status page.
Phone numbers and SMS
Validate, format and tidy phone numbers against each country's numbering plan, find the country, area code and time zone, split mobiles from landlines, and count SMS segments. These use Google's open-source libphonenumber data; none of them can say a line is in service.
- Phone
Phone number validator
Is this phone number real?Use it freeChecks a number against its country's numbering plan and returns its E.164 format, country and number type. Runs in your browser. - Phone
Phone number formatter
How do I convert my phone numbers to E.164?Use it freePaste a list or upload a CSV, pick the default country, and get every number in E.164, international or national format. Runs in your browser. - Phone
Phone number extractor
How do I pull the phone numbers out of this text?Use it freePaste notes, web pages or exports and get every phone number once, in E.164, without dates, prices or order numbers. Runs in your browser. - Phone
Landline or mobile checker
Which numbers on my list are mobiles and which are landlines?Use it freePaste a list or upload a CSV and get each number's line type from its country's numbering plan, with US and Canada numbers flagged where the digits can't tell. - Phone
SMS character counter
How many SMS segments will this message cost?Use it freeType or paste a text message and see characters, GSM-7 or Unicode encoding, segments, and the exact characters that cut your limit from 160 to 70. - Phone
Area code time zone lookup
What time is it in this area code, and can I call now?Use it freePaste area codes or phone numbers to get each one's time zone, local time and a callable-now flag for the 8am to 9pm window. Built on NANPA's area code database. - Phone
Phone number country lookup
Which country is this phone number from?Use it freePaste a list or upload a CSV and get each number's country and calling code, including which of the 25 places on +1 a number belongs to. - Phone
Add or remove country code
How do I add +1 to all my phone numbers?Use it freeAdd or strip a country code across a pasted list or a CSV column, with or without the +, handling the leading 0 that national numbers drop. - Phone
Remove duplicate phone numbers
How do I find duplicate phone numbers written in different formats?Use it freeNormalises every number to E.164 before comparing, so brackets, dots, spaces and +1 don't hide duplicates. Keeps the first row and all its columns. - Phone
Fake phone number generator
Which fake phone number can I use without reaching a real person?Use it freeNumbers from the ranges regulators reserve for fiction: 555-0100 to 555-0199 in North America, Ofcom's drama numbers in the UK, ACMA's in Australia. Copy or download as CSV. - Phone
Compare phone number lists
Which numbers on my call list are also on my opt-out list?Use it freeMatches two lists on the number, not the text: (415) 555-0100 in one matches +14155550100 in the other. Download A without B, the overlap, or B without A. - Phone
Phone number length checker
How many digits should a phone number have, and which of mine are too short?Use it freeDigits allowed after the country code for 245 countries and territories, mobiles and landlines, plus a list check that says how many digits each number is short or over. - Phone
Country calling codes list
Where can I get a list of every country's dial code as CSV or JSON?Use it free245 countries and territories with ISO code, +code, flag, exit and trunk prefixes, mobile and landline digit counts. Pick the columns, then download CSV, JSON, SQL or TypeScript. - Phone
US phone number checker
Is this +1 number in the US, or in Canada or the Caribbean?Use it freeReads each +1 number's area code against NANPA's database: US state, US territory, Canada, or another +1 country such as Jamaica or the Dominican Republic. US-only and non-US CSVs. - Phone
One-ring scam checker
I missed a call from an unknown number. Will calling back cost me?Use it freeSays what calling a number back would be: an ordinary call, international, a +1 number in another country (the one-ring pattern), premium rate, or a number no phone can have. - Phone
International dialing converter
What do I dial to call this international number from my country?Use it freePick the country you're calling from and get the digits to dial for every number: exit code, country code and the number without its trunk 0, plus the + form for mobiles and the local form. - Phone
Area code list by state
Where can I download a list of area codes by state?Use it freeEvery geographic area code in service across the +1 countries from NANPA's database: state or province and its code, country, time zones, overlays, in-service date and local dialling. One state or all, CSV, JSON or SQL. - Phone
GSM-7 character checker
Why is my text message limited to 70 characters?Use it freeLists every non-GSM character with what to replace it with, converts accents, smart quotes and emoji in one click, and shows the full GSM-7 set. - Phone
Toll-free number checker
Which numbers on my list are toll-free or premium rate?Use it freeFlags toll-free, premium-rate and shared-cost numbers in any country from the numbering plan, and downloads the list without them. - Phone
Phone number regex tester
Which phone number regex should I use, and what does it miss?Use it freeE.164, US (NANP), UK and a loose input filter, with code for JavaScript, Python and PHP, and a bulk tester that shows which matches aren't real numbers. - Phone
NPA-NXX lookup
Which rate center and carrier is a US phone prefix assigned to?Use it freeReads NANPA's public assignment files for the rate center, state, LATA and the carrier that was first given the prefix or its 1,000-number block. - Phone
WhatsApp link generator
How do I make a WhatsApp link with my number and a message?Use it freeBuilds a wa.me link and QR code in WhatsApp's documented format, with the number cleaned to international format. A list of numbers works too. - Phone
Country calling code lookup
What country is +44, and what do I dial to call it?Use it freeSearch by country or by code, both ways, for all 245 countries and territories in the numbering-plan data, with exit and trunk prefixes and a dial helper. - Phone
10DLC sample message and SMS opt-in generator
What should my SMS opt-in and 10DLC sample messages say?Use it freeFills in consent checkbox text, keyword calls to action, opt-in, HELP and STOP replies, campaign samples and the privacy clause from your brand details. - Phone
Area code lookup
Where is an area code, and which codes cover a state or city?Use it freeState or province, largest rate centers, time zone and overlays for every North American area code, a reverse search by state or city, and a bulk mode for lists. NANPA and CNAC data. - Phone
CSV to VCF converter
How do I turn a CSV or Excel contact list into a .vcf file?Use it freePaste or upload a CSV or .xlsx of contacts and download one .vcf file with names, phones, emails, company and notes, ready for iPhone, Android, Google or Outlook. In your browser. - Phone
TCPA calling hours checker
Is it inside the legal calling window where this number is, right now?Use it freeLocal time for each number from its area code, checked against the federal 8 a.m. to 9 p.m. rule and 19 stricter state rules quoted from statute, with the next allowed time. Not legal advice. - Phone
Click-to-call link generator
How do I make a phone number tappable on a website or in an email?Use it freeTurns a number into a tel: link and an sms: link with a pre-filled message, in E.164 form, with the HTML anchor to paste. Bulk mode for a list. In your browser. - Phone
Bulk phone number validator
How do I validate a whole list of phone numbers?Use it freePaste numbers or upload a CSV and get each one's format check, E.164 form, country and number type range from the numbering plan, with your columns kept. - Phone
Phone number splitter
How do I split phone numbers into country code and area code?Use it freePaste a list or upload a CSV and get country code, area code, local number and extension as separate columns, read from each country's numbering plan. - Phone
Phone list segmenter
How do I split a phone list by country?Use it freeGroup a pasted list or CSV by country, calling code, line type range, format check or US and Canada area code, with a CSV per segment and your columns kept. - Phone
Extract phone numbers from PDF
How do I get all the phone numbers out of this PDF?Use it freeDrop a PDF to pull every phone number from every page, matched against each country's numbering plan, deduplicated in E.164 with the page it was found on. - Phone
Extract phone numbers from Excel
How do I get every phone number out of this spreadsheet?Use it freeUpload an .xlsx, .ods or CSV to pull every phone number from every sheet and cell, deduplicated in E.164 with the sheet and cell where each was found. - Phone
Phone number QR code generator
How do I make a QR code for my phone number?Use it freeTurn a number into a QR code that starts a call (tel:), opens a text message (sms:) or saves a full contact card (vCard 3.0 or 4.0). Download PNG or SVG for print. - Phone
Vanity number converter
What words does my phone number spell, and what digits is 1-800-FLOWERS?Use it freeConvert letters to keypad digits for dialling, or list the English words a number spells for a memorable vanity number. Spellings only; it never says a number is available.
Calculators
Put your own numbers in and get the figures that decide a campaign: what verification will cost, how many inboxes a cold email volume needs, bounce, open, reply, unsubscribe and complaint rates against each ESP's published limits, warmup and a restart plan after a block, the 7-day Gmail spam-rate count, list decay and return on a send. Each calculator shows its formula, so you can rebuild it in a spreadsheet.
- Calculators
Cost calculator
What will cleaning this list actually cost?Use it freeCost per 1,000 addresses across subscription and pay-as-you-go vendors, including against the plan you are on now. - Calculators
Cold email inbox calculator
How many inboxes and domains do I need for cold email?Use it freeEnter your daily target and per-inbox limit to get inboxes, domains, warm-up time and monthly volume, checked against Google's published limits. - Calculators
Bounce rate calculator
Is my email bounce rate too high?Use it freeEnter sent, bounced and complaints to get your rates, checked against each platform's published suspension line and Google's complaint threshold. - CalculatorsMost used
Email verification cost by list size
What will verifying my list cost at each vendor?Use it freeYour list size and how often you check it, priced at SimpleVerifier and 8 other verifiers from their own pricing pages, lowest first, with a link to each. - Calculators
Instantly verification cost calculator
What does verifying my leads inside Instantly cost?Use it freeLeads a month and your Instantly credit plan, priced at 0.25 credits a lead from Instantly's own credit table, next to the SimpleVerifier plan that covers the same volume. - Calculators
Smartlead verification cost calculator
What does verifying my leads in Smartlead cost?Use it freeLeads a month priced at Smartlead's verification credit packs, monthly or one-time, next to the SimpleVerifier plan that covers the same volume. - Calculators
Sending limits calculator
How many emails can I send a day from Gmail or Outlook?Use it freePick Gmail, Google Workspace, Microsoft 365 or Outlook.com to see every published daily and per-email limit, which one caps you, and how many inboxes your volume needs. - Calculators
Cold email ROI calculator
Is cold email worth it for us, and what do bounces cost?Use it freeTurn prospects, reply, meeting and close rates, deal size and costs into monthly revenue, ROI and cost per meeting, plus the revenue lost to bounced addresses. - Calculators
Open rate calculator
What's my real email open rate?Use it freeOpen rate on delivered mail, click-through and click-to-open rates, and the rate without Apple's automatic opens, beside published averages with their sources. - Calculators
Email warm-up calculator
How long will it take to warm up my new inboxes?Use it freeEnter inboxes, target volume and step size and get a week-by-week warm-up ramp per inbox and in total, with Google's no-doubling rule built in. - Calculators
Email list decay calculator
How much of my old email list is still good?Use it freeEnter list size and age and pick a yearly rate (a BLS job-tenure model by role, or your own measured rate) to estimate how many contacts have gone stale. - Calculators
Spam complaint rate calculator
Is my spam complaint rate too high?Use it freeComplaints ÷ delivered, checked against Google's 0.1% target and the 0.3% limit in Google's and Yahoo's sender rules, with the complaint budget for your next send. - Calculators
SMS cost calculator
How much will this SMS campaign cost?Use it freeRecipients × messages × segments × per-segment price plus carrier fees, with the segment count from your actual text and the cost of unreachable numbers. - Calculators
Email A/B test calculator
Did variant B really win, or is it noise?Use it freeA two-proportion z-test on reply, open or click rates: p-value, lift and confidence interval, plus the sends each variant needs before a test is worth reading. - Calculators
List growth rate calculator
How fast is my email list really growing, after unsubscribes and bounces?Use it freeNew subscribers minus unsubscribes, hard bounces, complaints and other removals, divided by the starting list size: the growth rate per period, compounded to a year, with the formula shown. - Calculators
Email marketing ROI calculator
What does my email marketing return for each dollar it costs?Use it freeRevenue from email (known, or estimated from sends, bounce, click and conversion rates) against platform and other costs: ROI, return per $1, revenue and cost per subscriber. - Calculators
Cost per lead calculator
What did each lead really cost once the bad ones are taken out?Use it freeEnter spend and leads for each source, plus the share with invalid emails and duplicates, to get cost per lead, cost per valid lead and the spend lost on leads you can't reach. - Calculators
Call center staffing calculator (Erlang C)
How many agents do I need to answer 80% of calls in 20 seconds?Use it freeEnter calls per interval, average handle time and a service-level target to get the agents needed on the phones by Erlang C, the number to schedule after shrinkage, and the wait, ASA and occupancy at each staffing level. - Calculators
Best time to send email calculator
When do I hit send so the email lands at 9 AM in every time zone?Use it freePaste recipient time zones, cities or US/Canada phone numbers, pick the local time mail should arrive, and get a batch schedule in your own time zone, with daylight saving handled. - Calculators
TAM calculator
How big is my market, and how long will my lead list last?Use it freeEnter the accounts that fit your customer profile, contacts per account and your daily send volume to get TAM, SAM and SOM, the reachable list size and its runway in months. - Calculators
Cold email bounce cost calculator
How many bounces will this cold campaign throw, and what does cleaning it cost?Use it freeEstimated bounces a day and per inbox, the published 2% to 10% platform lines before and after verification, and the cost to verify the list at SimpleVerifier and other verifiers. - Calculators
Email list cleaning savings calculator
Will cleaning my email list pay for itself on my email platform bill?Use it freeEnter your list size, the share you expect to remove and your platform bill before and after. Get the monthly and yearly saving, the cost of cleaning here, the net for the first year and the months it takes to pay back. - Calculators
ESP bounce and complaint limit checker
What bounce rate gets my ESP account suspended?Use it freeYour hard bounce, complaint and unsubscribe rates against the lines Brevo, HubSpot, Amazon SES, Postmark, Instantly, lemlist, SendGrid, Klaviyo and Gmail publish themselves, with how many more bounces the same send could take. Platforms that publish no number are marked as such. - Calculators
Postmaster spam rate tracker
How many days until my Gmail spam rate has been under 0.3% for 7 days?Use it freeReads one line per day (a date and the Postmaster Tools spam rate, as a percentage or a ratio), bands each day against Google's 0.1% target and 0.3% limit, and counts the consecutive days below 0.3% that bulk senders need before mitigation, with the date the count reaches 7. Missing days end a streak. - Calculators
Sending recovery planner
How do I restart sending after a block or a bad send?Use it freeA day-by-day restart plan from your own numbers: day 0 to stop and clean, a week to 30-day engaged contacts, a week adding 90-day engaged, then older contacts only after verification as a small share of each day. Daily gates at 2% hard bounces and 0.1% complaints; CSV download. - Calculators
Waterfall enrichment cost calculator
What does my email-finding waterfall cost per email it finds?Use it freeEnter your contacts and each provider in waterfall order with its cost, find rate and whether it charges per lookup or per find. See what each step adds, its cost per extra email, coverage so far, and the cost per sendable email once verification failures are removed. - Calculators
Unsubscribe rate calculator
Is my unsubscribe rate too high?Use it freeUnsubscribes ÷ delivered for up to eight campaigns, the pooled rate across them, each campaign against your own average with the ones at twice the usual rate flagged, plus complaint rate and unsubscribes per complaint when you add complaints. - Calculators
Cold email reply rate calculator
What is my cold email reply rate, step by step?Use it freeSent, bounced, replies and positive replies for up to eight sequence steps give reply rate per prospect and per delivered email, positive share, each step's reply and bounce rate, and which steps earn their place.
Why these are free
A DNS lookup and a short SMTP conversation cost nothing per query. There is no per-check fee for us to recover, so charging for a single check would be a pricing decision rather than a cost. The tools are rate-limited per IP because port 25 connections are a shared resource, not because they are expensive.
The paid product is the bulk version of the same engine: CSV uploads to 100,000 rows, the email finder, website enrichment and cached repeat verification, for $39 a month. See what is included.
Reference
- Phone formats by country — calling code, trunk prefix, number length and example numbers for each country, with the E.164 conversion.
- SMTP error codes — what 550, 421 and 552 mean when a send fails, whether it is a hard or soft bounce, and whether to remove the address.
- Deliverability glossary — catch-all, spam traps, greylisting, authentication records and the rest.
- Disposable domain list — all 9,913 throwaway providers we block, with a page on each major one.