Email Normalizer

Normalize email addresses by applying common rules like lowercasing domains, removing dots for Gmail, and handling sub-addressing (+tags).

Input Email

About Email Normalization

Email normalization is the process of converting an email address to its canonical (standard) form. This is useful for deduplication, user account linking, and consistent storage.

Rules Applied by this Tool:

  • Domain part is converted to lowercase.
  • For Gmail/Googlemail addresses:
    • Dots (`.`) are removed from the local part (e.g., `user.name@gmail.com` → `username@gmail.com`).
    • The domain is standardized to `gmail.com`.
  • Sub-addressing (plus aliasing, e.g., `user+tag@domain.com` → `user@domain.com`) is handled for major providers like Gmail, Outlook/Hotmail/Live, Yahoo, and iCloud, and generally for others.
  • The local part (before the `@`) is generally lowercased for canonicalization, except for Gmail where case doesn't matter and dots are removed first.

Note: While these rules cover common cases, email address normalization can be complex due to varying server behaviors and RFC interpretations.