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Normalize email addresses for dedup and login matching. Use when cleaning lists; for validation use regex-tester. Input: emails ≤10MB. Returns normalized list. 100% client-side.
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Normalizes email addresses by applying common cleanup rules: converting to lowercase, stripping dots (for Gmail-style services), removing +aliases, and trimming whitespace. Supports batch processing of multiple emails and deduplication to find unique addresses from a list.
Many email providers (especially Gmail) treat variations of the same address as identical. This makes it difficult to compare, deduplicate, or validate email lists. This tool normalizes all variants to their canonical form for accurate comparison.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Marketing teams managing email lists, developers validating user registration data, system administrators cleaning up mailing lists, and anyone who needs to compare or deduplicate email addresses.
Paste email addresses into the textarea, one per line
Toggle normalization options: lowercase, strip dots, strip +aliases, trim whitespace
Click "Normalize" to process all emails with the selected options
Click "Deduplicate" to remove emails that normalize to the same address
Click "Copy All" to copy the normalized emails to your clipboard
Input: John.Doe+Work@Gmail.com, j.o.h.n.d.o.e@gmail.com -> Both normalize to: johndoe@gmail.comInput: alice@EXAMPLE.COM, alice@example.com -> With lowercase: alice@example.com (deduplicated)Input: ' bob+tag@outlook.com ' (with spaces) -> Trimmed and lowercased: bob+tag@outlook.comDoes Gmail really ignore dots? Yes
john.doe@gmail.com, j.o.h.n.d.o.e@gmail.com, and johndoe@gmail.com all deliver to the same inbox.
What about Yahoo or Outlook?
They do NOT ignore dots. Only enable strip dots if you are specifically targeting Gmail users.
Is strip + aliases safe?
The + symbol is a standard alias separator used by Gmail, Outlook, and many others. It is generally safe to strip.
Can I use this for validating email format? No
this tool normalizes format, not validity. Use an email validator for format checking.
Authoritative specifications, standards, and in-depth reading for Email Normalizer.
Gmail ignores dots and +aliases: john.doe+work@gmail.com = johndoe@gmail.com
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