Networking & Web

Email Address Normalizer

Strip Gmail dots and plus-aliases, Yahoo dash suffixes, and Outlook plus-tags to reveal the true canonical inbox behind an address.

Free & unlimitedRuns in your browserNo sign-up required

Email address to normalize

Normalizedusername@gmail.com

Local partusername

Domaingmail.com

ℹ Gmail plus-label removed: +label

ℹ Gmail dots in local part are ignored

Email Normalization Guide

Email normalization transforms raw user-entered email addresses into a canonical format, preventing duplicate accounts and improving deliverability analysis.

Gmail dot rule

Gmail ignores all dots (.) in the local part of an email address. user@gmail.com, u.s.e.r@gmail.com, and us.er@gmail.com all deliver to the same inbox. Normalizing Gmail addresses requires removing all dots in the local part before comparison.

Plus-addressing (sub-addressing)

Many email providers (Gmail, Outlook, ProtonMail) support plus-addressing: user+label@example.com delivers to user@example.com. Users exploit this to track which services share their email address. For deduplication purposes, the part after the + should be removed before comparing addresses.

Case sensitivity rules

Per RFC 5321, the domain part of an email is case-insensitive. The local part is technically case-sensitive, but virtually all major mail servers treat it as case-insensitive in practice. Always lowercase the entire address before storage to prevent duplicates.

Why normalization matters

A single real person can register multiple accounts using john@gmail.com, j.o.h.n@gmail.com, john+test@gmail.com, and JOHN@gmail.com. Without normalization, each registers as a unique account, skewing analytics, enabling abuse, and bypassing rate limits.

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How it works

Three steps, no setup

Paste an email address

The provider is detected automatically from the domain.

Get the canonical form

Provider-specific aliasing quirks are stripped out.

Spot duplicate signups

Compare two addresses that look different but land in the same inbox.

Common questions

Frequently asked questions

Why does Gmail ignore dots?

Gmail treats "j.smith@gmail.com" and "jsmith@gmail.com" as the exact same inbox, which this tool accounts for when normalizing.

What is a plus-alias used for?

Adding +something before the @ (like jane+newsletter@gmail.com) still delivers to the base inbox, letting people filter or track where a signup came from.

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Networking & Web

Email Address Normalizer

Email Normalization Guide

Gmail dot rule

Plus-addressing (sub-addressing)

Case sensitivity rules

Why normalization matters

Three steps, no setup

Paste an email address

Get the canonical form

Spot duplicate signups

Frequently asked questions

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