Email Validator

Validate email address format

The Email Validator checks whether email addresses are correctly formatted — one at a time or in bulk. Paste a list separated by commas or new lines and instantly see which are valid and which aren't, with a running count. It runs entirely in your browser, so your list stays private.

What "valid" means here

This tool validates the syntax of an email address against the standard format rules: a local part, an @ symbol, and a properly structured domain with a top-level domain. It does not connect to mail servers, so it confirms an address is well-formed — not that the mailbox actually exists. Format validation catches the most common errors: typos, missing @, spaces, and malformed domains.

How to use it

1. Paste one or more email addresses (comma or line separated).
2. See each marked valid or invalid, with a summary count.
3. Fix the invalid ones in your source list.

Common reasons emails fail

Problem	Example
Missing @	name.example.com
No domain extension	name@example
Spaces	na me@example.com
Double dots	name@example..com

Format validation vs verification

Format validation (what this tool does) is instant and private, and it's the right first step for cleaning a list or validating a form. Verification — confirming the mailbox exists and can receive mail — requires contacting the mail server and is something only a backend service can do. Use format validation to catch obvious errors cheaply, then rely on a confirmation email for true verification.

Great for

• Cleaning email lists before importing or sending.
• Spotting typos in signup data.
• Validating form input rules.
• Quick bulk checks of a pasted column.

Private and free

All validation happens in your browser — your email list is never uploaded or stored. The tool is completely free with no limits.