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Email Normalizer

Reduce every address to the mailbox it delivers to.

Email Validator Tools Reviews Free · no sign-up

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

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The last one is off by default: most hosts do use +, but assuming it for an unknown domain can merge two real mailboxes.

Quick Tool Overview

The Email Normalizer reduces every address to one canonical form — lowercased, Gmail dots removed, tags stripped, punycode applied — with each rule on its own switch so it matches what your system does.

What it does
Reduces addresses to a single canonical form
You give it
A list of addresses
You get back
Original and normalised side by side, changes marked
Rules
Lowercase, Gmail dots, provider tags, punycode
Best for
Comparison, deduplication and suppression matching
Email Validator Tools Free, unlimited use No sign-up Runs in your browser

About the Email Normalizer

Canonicalising an address is what lets you compare two of them reliably: it is how you tell that someone signing up with a fresh plus-tag is the same account you banned last week, and how a suppression list actually suppresses.

Paste a list and each address is reduced to a single canonical form — lowercased, Gmail dots removed, provider sub-address tags stripped, googlemail folded into gmail, internationalised domains encoded to punycode. Each rule is a switch, so you can match whatever your own system does rather than whatever this tool prefers.

The original and normalised forms are shown side by side, and only the rows that changed are highlighted, so a list that needed no work says so instead of looking like it did something.

Key features of the Email Normalizer

Every rule optional

Switch each one on or off to match your own system.

Side by side

Original and normalised together, with changed rows highlighted.

Provider-accurate

Dots stripped only where the provider actually ignores them.

Punycode applied

International domains reduced to their ASCII form.

CSV export

Take both columns out together.

How to use the Email Normalizer

  1. 1

    Paste your addresses

    One per line, or any reasonable separator.

  2. 2

    Pick your rules

    Lowercase, dots, tags, punycode — each one on its own switch.

  3. 3

    Compare side by side

    Original and normalised, with the changed rows marked.

  4. 4

    Copy the result

    The normalised list, or both columns as CSV.

Frequently asked questions

The single form that every variant of an address reduces to — case folded, tags stripped, provider quirks applied. Two addresses with the same canonical form reach the same mailbox, which is what makes comparison reliable.

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