Email Syntax Validator
Check a list of email addresses for structural validity.
Your result will appear here as soon as you add some input.
How to use it
- 1Paste your input into the input box, or type it directly.
- 2Adjust the options if you need something other than the defaults.
- 3The result updates as you type.
- 4Copy the result to your clipboard or download it as a file.
About the Email Syntax Validator
The check is deliberately permissive. The real grammar for an address allows quoted local parts, plus addressing and internationalised domains, and over-strict validation rejecting valid addresses is a far more common bug than accepting invalid ones.
No syntax check can tell you whether an address exists or accepts mail. Only sending to it can, which is what a confirmation email is for.
Questions people ask
Is your code uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your code never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.