Email Format Validation
Instantly check email syntax against RFC-style rules - 100% client-side, no DNS or mailbox lookups.
This tool instantly checks whether an email address is correctly formatted - proper structure, valid characters, correct placement of the @ symbol and domain - without performing any DNS or SMTP lookups. It catches obvious typos and formatting mistakes quickly, right in your browser.
Frequently asked questions
No - this only validates the FORMAT/syntax of the address, not whether the mailbox actually exists or can receive email. A correctly formatted address can still be non-existent, and full verification would require DNS/SMTP checks this tool intentionally doesn't perform.
This tool is designed for instant, purely client-side format checking without network requests - DNS/SMTP verification requires actual network lookups and raises its own complexities (like some mail servers refusing to confirm mailbox existence for privacy/spam reasons).
Common issues like missing @ symbols, invalid characters, malformed domains, or missing top-level domains (like ".com") - the structural mistakes that make an email address definitely invalid regardless of whether the mailbox exists.