Free tool
Is this email address formatted right?
Paste one address. We check the format and point to the exact problem if something is off. Instant, no network call.
We don't save the email address you check.
Good to know
What a format check covers
A format check covers the basics: one @ symbol, a valid local part, a domain with at least one dot, and no illegal characters. It runs entirely in your browser, so the result is instant.
Use it to catch obvious typos in a form, to filter junk out of a list before a deeper check, or to understand exactly which rule an address is breaking. The parse receipt shows every detail, not just a bare yes or no.
91-93% real-world accuracy comes from full verification, not format alone. Format is the cheapest check and also the weakest signal: a clean format still needs a real verification to confirm the mailbox exists.
Does valid format mean the email address actually works?
No. A perfectly formatted address can still bounce. Format checking only confirms the shape is right, not that the mailbox exists. To know if an address will deliver, verify it against the live mail server.
What makes an email address invalid?
Common problems: missing or duplicate @ symbol, an empty local part (nothing before @), a domain with no dot, spaces anywhere in the address, illegal characters in the local part, or a top-level domain that is too short or made up of numbers only.
How is a format check different from email verification?
A format check runs instantly in your browser and only confirms the address is shaped like a valid email. Email verification goes further: it checks the domain's MX record, probes the mail server, and returns a verdict on whether the address can actually receive mail. Format is step one; verification is the real answer.
Is the check private?
Yes. The format check runs entirely in your browser. We don't save the email address you check.