Web Tools
Email Validator
Validate and parse email addresses per RFC 5322 rules. Single and batch modes, local/domain/TLD breakdown, detailed error messages, warnings for uncommon patterns, disposable domain detection, sub-addressing detection. Runs entirely in your browser — your data never leaves your machine.
email validator rfc5322 parser batch format
Published May 30, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Enter an email address (or a list of them) and get instant validation against RFC 5322 rules. The tool parses the local part, domain, and TLD, checks for structural errors, and flags potential issues like disposable domains or uncommon TLDs.
Features
- RFC 5322 validation: checks local part rules (dots, special chars, length), domain rules (labels, hyphens, TLD), and overall length limits
- Single and batch mode: validate one email or bulk-validate a list separated by newlines, commas, or semicolons
- Email parsing: breaks down into local part, domain, and TLD
- Smart warnings: flags sub-addressing (+), quoted local parts, disposable email domains, IP literals, and uncommon TLDs
- Detailed errors: specific messages for each validation failure (consecutive dots, invalid characters, missing @, etc.)
- Batch summary: shows valid/invalid count with one-click copy of valid addresses
- 6 examples: standard, sub-address, subdomain, quoted, and invalid cases
- Private: runs entirely in the browser — no data transmitted
Use Cases
- Validating email addresses before adding to a mailing list
- Cleaning up CSV exports with email columns
- Debugging email deliverability issues
- Checking for common email format mistakes
- Filtering out disposable email addresses