Email Address Validator - Format Checker
Check if an email address has valid formatting with detailed rule-by-rule feedback. Validates local part, domain, and structure.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the Email Validator work?
The tool runs a series of regex and structural checks against the email string: it verifies exactly one @ symbol, validates the local part (before @) for allowed characters and length, checks the domain for proper format with at least one dot and valid TLD length, and ensures the total length is within the RFC 5321 limit of 254 characters. Each rule produces a pass/fail result shown as a checklist.
Does this check if the email address actually exists?
No. This tool validates the format and structure of the email address (correct syntax, valid domain format, proper characters). It cannot verify whether the mailbox exists on the mail server without sending a test email.
What rules does it check?
Valid characters in the local part (before @), presence of exactly one @ symbol, valid domain format with at least one dot, proper length limits, and no prohibited characters or patterns.
Can I validate multiple emails at once?
Enter one email address at a time for detailed rule-by-rule feedback. The validator shows exactly which rules pass and which fail for each address.