Email Validator
Check whether an email address is correctly formatted, with a plain-English reason when it isn’t.
How this tool works
Enter an email address
Type or paste the address you want to check.
Step-by-step validation runs
The checker walks the string looking for a missing "@", a stray space, or a domain with no dot.
Read the specific reason
If it fails, you get exactly which rule was broken, not just "invalid email."
See the breakdown
A valid address is split into its local part and domain for a quick sanity check.
Quick facts
- Category
- Validators
- Best for
- Catching typos in a signup form before submission
About this tool
Paste an email address to check its structure against the rules a real mail system expects: exactly one "@", a non-empty local part, and a domain containing at least one "." in a sensible position. Rather than a single pass/fail regex result, this tool walks the string step by step so the error message tells you specifically what’s wrong - a missing "@", a stray space, or a domain with no dot - instead of a generic "invalid" verdict. It checks formatting only; it can’t tell you whether the mailbox actually exists or accepts mail, since that requires contacting the receiving mail server. Runs entirely client-side.
Why use this tool
Specific failure reasons
Points to exactly what’s wrong - a missing "@", a bad domain - instead of a generic invalid verdict.
Local part / domain breakdown
See the address split into its two components to confirm it parsed the way you expected.
Honest about its limits
Clearly explains that format checking can’t confirm a mailbox actually exists or accepts mail.
Instant, no submission required
Check an address before it ever reaches a signup form or a mailing list.
Frequently asked questions
No - this only checks that the address is well-formed (correct placement of "@" and ".", no spaces, non-empty local part and domain). Confirming a mailbox actually exists requires either sending a message or performing an SMTP handshake with the receiving mail server, which isn’t possible from a browser-based tool.
The most common causes are a trailing space copied in from another document, a domain missing its top-level part (like "user@company" instead of "user@company.com"), or more than one "@" symbol in the string.
This validator targets the common ASCII local-part@domain.tld shape used by the overwhelming majority of real addresses. Exotic but technically legal forms - quoted local parts, IP-literal domains - may be flagged as invalid even though some mail servers would accept them.
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