Email address validator
Check an email address format (syntax, domain) right in your browser.
Checks format only, not whether the mailbox actually exists (not possible client-side).
🔒 100% client-side — no data sent
Check an email address format: valid syntax (local part, at sign, domain name) and domain validity. Handy for testing an address, cleaning a list or validating form input. 100% browser-side validation, so your addresses never leave your device.
What is it for?
- ▸ Check an email entered in a form before submitting.
- ▸ Clean a mailing list of malformed addresses.
- ▸ Test an email validation regex during development.
- ▸ Quickly check a suspicious or misspelled address.
FAQ
Does this validator check that the address really exists?
No: it only checks the format and domain structure. Confirming that a mailbox actually exists requires a server-side SMTP check, which isn't possible in the browser.
What makes an email address valid?
A local part, an at sign (@) and a domain with at least one dot, with no spaces or forbidden characters. The official standard is defined by RFC 5322.
Are addresses with accents or Unicode characters valid?
Technically yes, via internationalization (EAI/IDN), but not all servers accept them. Using ASCII characters is safer.
Are my addresses sent anywhere?
No. All processing happens locally in your browser; no address is transmitted or stored.