Email Normalizer
Normalize email addresses by removing dots (Gmail), stripping +tags, and lowercasing. Process multiple emails at once for deduplication and cleaning. Code never leaves your device — formatting and validation run locally in your browser.
How to Use the Email Normalizer
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Frequently Asked Questions
What normalizations are applied?
Lowercasing the domain, removing dots from Gmail addresses (before @), stripping +tags, and trimming whitespace.
Why remove dots from Gmail addresses?
Gmail ignores dots in the local part. john.doe@gmail.com and johndoe@gmail.com are the same inbox. This helps deduplicate.
Can I normalize multiple emails at once?
Yes. Paste a list of emails (one per line) and all will be normalized in batch.
Does this work with all email providers?
Gmail-specific rules (dot removal, +tag stripping) are applied only to Gmail/Googlemail addresses. Other providers get standard normalization.
Are my email addresses stored?
No. All normalization happens locally in your browser. No email data is transmitted or stored.
What makes an address invalid, and which throwaway domains are flagged?
Rejected: empty input, missing @, empty local part, domain without a dot, local part over 64 chars, domain over 253 chars, leading/trailing . - _ and double-dot runs. 16 disposable domains flag as throwaway, including mailinator.com, guerrillamail.com, yopmail.com, 10minutemail.com and trashmail.com.
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Last updated October 2026