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Email Normalizer

Normalize email addresses in bulk. Lowercase, trim, remove Gmail dots, strip plus aliases, and deduplicate lists.

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How to use Email Normalizer

  1. Paste a list of email addresses (one per line or comma-separated).
  2. Choose normalization options (lowercase, remove dots, strip aliases).
  3. Copy the cleaned, deduplicated list.

What is Email Normalizer?

Email normalization standardizes email addresses to their canonical form. This catches duplicates that differ only in formatting — for example, Gmail ignores dots in the local part (j.doe@gmail.com = johndoe@gmail.com) and everything after a + sign is an alias.

This tool processes a list of emails and applies configurable normalization rules. Use it to clean mailing lists, deduplicate user registrations, and prevent duplicate signups.

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FAQ

Does Gmail ignore dots?
Yes. Gmail treats j.doe, johndoe, and john.doe as the same address. This tool can remove dots for Gmail addresses to catch these duplicates.
What are plus aliases?
Gmail (and others) support user+tag@domain.com — everything after + is ignored. This lets users create disposable aliases. This tool strips the +tag part.
Is this GDPR compliant?
The tool runs entirely in your browser — no data is uploaded. You're responsible for handling email data according to your local regulations.

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Author

1S
1Stop Tools"The Toolsmith"

Editorial Team at 1Stop Tools

The 1Stop Tools editorial team tests, reviews, and curates every utility on this platform. We believe tools should be free, fast, and private, with no accounts, no uploads, and no tracking. Every tool on this site runs entirely in the browser, and we test on multiple devices and browsers to ensure reliability for everyone, everywhere, on any connection.

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