Free tool

Normalize email addresses for deduplication

Preview the canonical form EmailGuard stores—local part, domain, and subaddressing flags.

Why this signal matters

Duplicate signups from the same person using [email protected] and [email protected] inflate user counts and skew analytics. Normalization at ingest gives you one row per real mailbox and makes merge logic in your CRM predictable.

Related tools

Email Syntax Checker
Validate RFC-aware syntax, TLDs, and common formatting mistakes before an address hits your database.
Full Email Validator
Run the complete detection stack—syntax, normalization, role, public, relay, and disposable—in one pass.

Need volume, webhooks, or team access?

The same detection stack powers the EmailGuard API. Start free, then scale with scoped API keys and predictable rate limits.

Start validating free View API docs