Email Normalizer
Normalize an email address by lowercasing it, and optionally stripping Gmail-style dots and plus-tag segments, to help spot duplicate accounts.
johndoe@gmail.com
• Removed a + tag segment
• Removed dots (ignored by Gmail)
Recommended Settings
Pro Tips
- •Gmail (and Google Workspace) uniquely ignores dots anywhere in the local part - 'j.doe@gmail.com' and 'jdoe@gmail.com' deliver to the exact same inbox
- •Plus-tagging (like 'jdoe+shopping@gmail.com') is supported by most major providers as a way to filter or track where an email address was used, but the tag isn't part of the real address
- •Dot-stripping is applied only for Gmail and Google Workspace domains, since most other providers treat dots as meaningful characters
- •This is a heuristic based on well-documented provider behavior, not a live verification - always confirm against the specific provider's actual rules for critical deduplication logic
Most Popular
Most people normalize emails to detect duplicate sign-ups where a user registered twice using dots or a plus tag
When to Use This Tool
Identify user records that are actually the same person using Gmail dot or plus-tag variations.
See what a plus-tagged test email normalizes to, for setting up filtering rules.
Check whether two differently formatted email addresses actually reach the same inbox.
Normalize a list of email addresses to a consistent, comparable format.
How It Works
Split the email into its local part (before @) and domain, and lowercase the domain
Optionally strip everything from a + onward in the local part, for providers known to support plus-tagging
Optionally remove dots from the local part specifically for Gmail and Google Workspace domains, which treat them as insignificant
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Client-side email address normalization for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
Does every email provider ignore dots?
No, this behavior is specific to Gmail and Google Workspace. Most other providers, including Outlook and Yahoo, treat dots in the local part as significant, distinct characters.
Is plus-tagging supported everywhere?
Most major providers (Gmail, Outlook, Yahoo, iCloud, and others) support it, but it's not a universal email standard - some smaller providers may not honor plus-tags at all.
Can this guarantee two emails are duplicates?
It's a strong heuristic based on well-documented provider behavior, but for guaranteed deduplication, sending a verification email to both addresses is the only fully reliable method.
Is my email address sent anywhere?
No. All normalization happens locally in your browser.