Many email addresses point to the same inbox despite looking different — Gmail ignores dots and anything after a plus sign. This tool normalizes addresses so you can detect duplicates and aliases, processing everything locally in your browser.
How to use it
- Paste one or more email addresses, one per line.
- Each is normalized to its canonical form.
- Duplicates that resolve to the same inbox are flagged.
- Copy the cleaned list.
About Email Normalizer
A single Gmail inbox can receive mail at countless variations: dots in the local part are ignored, and anything after a plus sign is a sub-address. People exploit this to create "different" signups that all reach one inbox. Normalizing addresses to a canonical form lets you spot these duplicates and aliases — valuable for cleaning mailing lists, preventing abuse, and deduplicating user records. This tool applies the common provider rules and runs entirely client-side, so the addresses never leave your browser.
FAQ
What does normalization do to a Gmail address?
It lowercases the address, removes dots in the local part, and strips any +tag, since Gmail treats all of those as the same inbox.
Does this work for all providers?
It applies common rules (notably Gmail’s). Some providers have their own quirks, so treat results as a strong guide rather than an absolute.
How can two different-looking emails be the same inbox?
Many providers ignore dots and everything after a plus sign — so user.name+promo@gmail.com and username@gmail.com reach the same inbox. Normalizing reveals these aliases, which is useful for detecting duplicate sign-ups.