Email Format Checker
Check whether an email address is validly formatted.
Catching the obvious mistakes
This checks that an email address is shaped correctly — a local part, an at-sign, a domain with a dot — catching the typos and malformed entries that should never reach your system: the missing at-sign, the double dot, the trailing space. It is the fast first line of validation for a form field or a list of addresses.
Enter an address and it reports whether the format is valid.
Format is not existence
An honest and important limit: checking the format tells you an address could exist, not that it does. A perfectly-formatted address can be a typo of a real one, or a mailbox that was closed years ago — format validation cannot know. The only way to confirm an address actually receives mail is to send to it, which is why sign-up flows use confirmation emails. Use format checking to reject the clearly-broken entries, and a confirmation step to prove an address is real.
Email Format Checker FAQ
Does a valid format mean the address exists?
No — it means the address is shaped correctly, not that the mailbox exists. Only sending mail can confirm that.
What does it catch?
Malformed addresses — a missing at-sign, a double dot, a trailing space — the obvious errors that should never reach your system.
Is my input uploaded?
No. The check happens in your browser.