Email Validator
Check whether an email address matches the common dot-atom syntax.
This tool runs entirely in your browser. Your files are never uploaded to a server.
Valid: The address matches the supported common email syntax.
- Local part: 10 characters
- Domain: example.com
Clear the entered value before starting another check. Validation runs locally and does not check against any external registry, server, or account.
What this tool does
Checks an email address against the common dot-atom local-part syntax and a public two-label domain, without querying any mail server.
How to use it
Enter an address. The checker splits it at a single @, verifies the local part's characters and dot placement, then parses the domain and validates each label.
Example
Entering [email protected] returns valid with the local part person+tag and the domain lowercased to example.com.
Validation
The local part must use unquoted dot-atom characters (letters, digits and !#$%&'*+/=?^_`{|}~.- ) up to 64 characters, with no leading, trailing or doubled dots; the domain must contain at least two labels of 1–63 characters, each without leading or trailing hyphens, and the full address must stay within 254 characters.
How to interpret the result
A valid result means the address is syntactically well-formed, not that the mailbox exists or currently accepts mail — this tool never contacts a mail server or performs an MX lookup.
Limitations
Quoted local parts, comments, IP-literal domains and internationalized (non-ASCII) addresses are outside this checker's supported dot-atom syntax and will be marked invalid even if some mail systems accept them.
Privacy
All processing uses local browser APIs and this tool does not upload the values you enter.
Frequently Asked Questions
- What does Email Validator do?
- Checks an email address against the common dot-atom local-part syntax and a public two-label domain, without querying any mail server.
- How does it handle invalid input?
- The local part must use unquoted dot-atom characters (letters, digits and !#$%&'*+/=?^_`{|}~.- ) up to 64 characters, with no leading, trailing or doubled dots; the domain must contain at least two labels of 1–63 characters, each without leading or trailing hyphens, and the full address must stay within 254 characters.
- Is entered data uploaded?
- All processing uses local browser APIs and this tool does not upload the values you enter.