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Validate email addresses instantly.
Type or paste an email address.
Click Validate to check the email format.
See if the email format is valid or invalid.
An email validator checks whether an email address is written in a valid format: a local part, an @ sign, and a domain with a proper structure. Paste a single address or a whole list and see which ones are well-formed and which have mistakes.
Format validation catches the common errors, missing @, double dots, illegal characters, a domain with no dot, before they cause bounced messages or failed signups. Everything runs in your browser, so your address lists stay private.
Format validation confirms an address is shaped correctly, which stops typos and obviously broken input. What it cannot do is prove the mailbox exists or will accept mail; that requires actually contacting the mail server. So a valid-format address may still bounce, but an invalid-format one is guaranteed to. Format checking is the cheap first filter that removes the certain failures.
The frequent culprits are a missing or doubled @ sign, spaces inside the address, a domain with no dot like user@localhost, consecutive dots like [email protected], and a trailing dot. Pasting a list here surfaces every malformed row at once, which is far faster than discovering them one bounce at a time after a campaign sends.
Before importing subscribers or sending a campaign, run the list through format validation to strip the entries that cannot possibly deliver. This protects your sender reputation, since high bounce rates get you flagged by mail providers. Combine format cleaning with a live verification service for the addresses that pass, for a two-stage filter.
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