Email Validator — Check Email Format & Syntax
Validate email addresses instantly. RFC 5322 compliant. 100% private.
About Email Validator
Validate email addresses using comprehensive regex pattern matching. Checks format, syntax, domain structure, TLD validity, and RFC 5322 compliance for both standard and internationalized email addresses.
Perfect for developers validating form input, cleaning email lists, or anyone needing to verify email format before sending. All validation is instant and happens locally in your browser.
How to Use Email Validator
- Enter or paste an email address.
- Validation happens instantly as you type.
- View detailed validation results.
- See what's valid or what needs fixing.
- Batch validate multiple emails (one per line).
Key Features
RFC 5322 compliance
Regex pattern matching
TLD validation
Domain structure check
Local part validation
Plus-addressing support
Subdomain support
Batch validation mode
Real-time validation
100% client-side
Frequently Asked Questions
What makes an email valid?
A valid email has three parts: local part (before @), @ symbol, and domain with TLD. It must follow RFC 5322 standards for characters, length, and format.
Does this check if email exists?
No. This tool validates format and syntax only. It does NOT verify if the email address actually exists or can receive mail. Use SMTP verification for that.
What email formats are supported?
Standard formats like user@domain.com, plus internationalized domains, plus-addressing (user+tag@domain.com), dots (first.last@domain.com), and subdomain emails.
Is my email safe to check here?
Yes! All validation happens in your browser using JavaScript. No email addresses are sent to any server or stored anywhere.
Why does my valid email show as invalid?
Ensure there are no spaces or typos. Some uncommon formats may not pass strict regex validation even if technically valid per RFC standards.