Email Normalizer & Deduplicator
Clean, normalize and deduplicate email lists in seconds
Normalization options
Total input
Valid
Normalized
Duplicates removed
What is email normalization?
Email normalization is the process of standardizing email addresses to a canonical form — converting to lowercase, removing whitespace, and applying provider-specific rules like Gmail's dot and plus alias removal.
Gmail & provider rules
Gmail treats dots in the local part as insignificant: j.doe@gmail.com and jdoe@gmail.com are the same inbox. Plus aliases (user+tag@gmail.com) are also stripped. This tool handles both rules automatically.
Privacy first
All processing happens entirely in your browser. Your email list never leaves your device — no server, no upload, no log.
Frequently asked questions about Email Normalization
Everything about cleaning and deduplicating email lists
Email normalization converts email addresses to a consistent, canonical form. This includes lowercasing, trimming whitespace, and applying provider-specific rules. Normalized lists have fewer false duplicates and improve deliverability for email campaigns.
Gmail ignores dots in the local part of the address. This means j.o.h.n@gmail.com, john@gmail.com, and j.o.h.n@gmail.com all deliver to the same inbox. This tool removes all dots from Gmail addresses so these variations are correctly treated as duplicates.
Gmail allows you to add a plus sign and any text after your username: user+newsletter@gmail.com still goes to user@gmail.com. These aliases are useful for filtering, but can create duplicates in mailing lists. This tool strips everything after the plus sign for Gmail addresses.
Duplicate emails in your mailing list waste money (most ESPs charge per email sent), hurt engagement metrics, and may result in complaints or unsubscribes. Normalization before deduplication catches duplicates that differ only in case or Gmail-specific variations.