Email Validator

How to use

1. 1Paste your email list into the input area. One address per line works, but commas, semicolons, pipes, and 'Name <addr>' formats are also accepted.
2. 2Read the Validation summary to see how many entries are valid, invalid, duplicates, role-based, disposable, plus-tagged, or carrying a typo suggestion.
3. 3Switch between the Valid, Invalid, and Suggestions tabs to copy a clean output, review every reason an address was rejected, or apply a one-click typo fix.
4. 4Toggle Deduplicate, Exclude role-based, Exclude disposable, or Exclude typo-suggested to refine the valid output for newsletter or CRM imports.
5. 5Use Replace with valid only to load the cleaned list back into the input, or click Copy on any tab to grab the result.

About this tool

Email Validator parses every address in a list and runs a deterministic set of practical RFC 5322 and DNS hostname checks against it, all in your browser. Paste one address per line (or separated by commas, semicolons, or pipes), and the tool splits the input, extracts the address from common name formats like 'Alice <alice@example.com>', and validates each entry against the rules that real-world mail servers actually enforce: exactly one @ separator, a 1 to 64 character local part with no leading, trailing, or consecutive dots, a 1 to 253 character domain made of valid 1 to 63 character labels with no leading or trailing hyphens, at least two labels (so user@localhost is rejected for general internet use), and a final top-level domain that is 2 or more characters long and contains at least one letter (so numeric-only TLDs and single-character TLDs are caught). Internationalized domains like münchen.de are converted to their ASCII Punycode form via the URL constructor before length and label checks, so non-Latin domains are handled correctly. The validator does not stop at pass or fail. Each address is also tagged when it looks like a role-based shared inbox (info@, support@, admin@, billing@, sales@, hr@, no-reply@, postmaster@), when it sits on a known disposable or throwaway domain (mailinator, 10minutemail, guerrillamail, yopmail, tempmail, throwaway, dispostable, and similar), and when it carries a plus-tag (user+newsletter@gmail.com). Likely typos are detected by Levenshtein distance against the most common free-mail providers, so gmial.com, yhoo.cm, hotnail.com, outlok.com, protnomail.com, and friends get a one-click suggested fix in a dedicated Suggestions tab. Deduplication understands subaddressing: 'User+tag@gmail.com' and 'user@gmail.com' collapse to the same Gmail account, and Gmail's dot-folding (firstlast vs first.last vs f.i.r.s.t.l.a.s.t) is normalized too. The result panel splits into Valid, Invalid (with per-address reasons), and Suggested fixes views, with copy buttons for each one and a one-click 'Replace input with valid only' that keeps your form filling moving. Optional toggles let you exclude role inboxes, disposable domains, or typo-suggested addresses from the valid output, which is exactly what most newsletter and CRM imports want. The validator does not perform DNS lookups, MX queries, SMTP probes, or any network call, so the addresses you paste here are never uploaded, no rate limit applies, and the tool works fully offline.

Free to use. Works in your browser. No signup, no login.