Email Validator
Validate email addresses
Validate email addresses Runs locally in your browser
Separate several addresses with commas, spaces or new lines.
About the
The Email Validator checks a list of addresses for correct syntax and marks each one valid or invalid, handling several at a time separated by commas, spaces or new lines. It checks the shape of the address, not whether the mailbox exists, which is the honest limit of any client-side check. Use it to clean a mailing list before an import, or to catch typos in a signup form before they turn into bounces.
Where people use the
- Cleaning a mailing list before importing it into a campaign tool.
- Checking a pasted list of signups for typos.
- Validating test fixtures before a bulk import.
- Finding the one bad row that is breaking an upload.
How to use the
- 1
Paste the addresses
One per line, or separated by commas or spaces. Any number of addresses can be checked at once.
- 2
Run the check
Each address is listed with VALID or INVALID next to it, in the order you entered them.
- 3
Look at the failures
A missing @, a missing dot in the domain, a space inside the address or a trailing comma are the usual causes.
- 4
Clean and re-run
Fix the failures and run again to confirm the list is clean.
Tips and best practices
- Syntax is not existence; a valid address can still bounce.
- Separate addresses with new lines rather than commas when they come from a document.
- Watch for a trailing comma on the last address of a list.
Frequently asked questions
Does this prove the address exists?
No. It checks syntax only. Proving a mailbox exists means sending mail or querying the mail server, which no browser tool can do.
Why is a valid-looking address marked invalid?
Usually a stray space, a comma left inside the address, or a missing top-level domain. The check requires an @, a domain, and a dot in the domain.
Does it accept addresses with plus signs or tags?
Yes. Anything before the @ that contains no whitespace or @ is accepted, so plus addressing passes.
Will it catch a typo in the domain?
Only if the typo breaks the syntax. gmial.com is syntactically valid and will pass, because there is no way to tell it apart from a real domain from the browser.
Is my list uploaded?
No. Checking happens in your browser, so customer lists never leave your device.