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Email Deduplicator

Remove duplicates, including the ones Gmail hides.

Email Validator Tools Reviews Free · no sign-up

Drop a .csv or .txt list here, or click to choose

The first option catches the duplicates an exact match misses, which is most of them.

Quick Tool Overview

The Email Deduplicator removes duplicates on the normalised form, so Gmail dots, plus and hyphen tags and mixed case all collapse into the one real mailbox instead of slipping past an exact match.

What it does
Removes duplicate addresses, including disguised ones
You give it
A list of addresses
You get back
One address per real mailbox, in the original order
Matching modes
Exact, case-insensitive, or full normalisation
Best for
Stopping one person receiving the same send three times
Email Validator Tools Free, unlimited use No sign-up Runs in your browser

About the Email Deduplicator

An exact-match dedupe misses most of the real duplicates on a list. a.da@gmail.com, ada@gmail.com and ada+newsletter@gmail.com are one mailbox and one person, and that person gets your email three times and reports it once.

This deduplicates on the normalised form instead: case folded, Gmail dots removed, provider sub-address tags stripped, googlemail.com folded into gmail.com. Yahoo uses a hyphen rather than a plus, and that is handled too — and, importantly, a hyphen is not stripped at domains where it is just part of a name.

Every duplicate group is shown with the variants that collapsed into it, so you can see exactly what was merged and pick which form to keep.

Key features of the Email Deduplicator

Catches disguised duplicates

Gmail dots, plus tags and Yahoo hyphens all resolve correctly.

Provider-aware rules

A hyphen is only a tag at the providers that treat it as one.

Groups shown

Every variant that collapsed into a kept address is listed.

Original order preserved

The first occurrence is the one kept.

Three strictness levels

Match whatever your own platform counts as a duplicate.

How to use the Email Deduplicator

  1. 1

    Paste your list

    Any separator — line breaks, commas, semicolons or tabs.

  2. 2

    Choose the matching

    Exact, case-insensitive, or full normalisation with tags and dots.

  3. 3

    Review the groups

    Each set of duplicates is shown with every variant in it.

  4. 4

    Copy the unique list

    One address per real mailbox, in the original order.

Frequently asked questions

No. Gmail ignores them entirely when routing, so a.d.a@gmail.com and ada@gmail.com are the same mailbox. Almost no other provider works this way, which is why the dot rule is applied only to Gmail and Googlemail.

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