Development
Email Normalizer
Trim surrounding whitespace and lowercase the domain while retaining the mailbox portion unless you explicitly opt in to changing it.
About this tool
When to use it
Trim surrounding whitespace and lowercase the domain while retaining the mailbox portion unless you explicitly opt in to changing it.
How to use it
Enter one address, leave local-part lowercasing off for conservative cleanup, and select Normalize email. Inspect the result before copying it into a contact record. Confirm the address with its owner when delivery or account identity matters.
Guide updated . Examples checked against this implementation.
Worked examples
Preserve a tagged mailbox
Input
Developer+Tools@Example.COM Expected output
Developer+Tools@example.comThe domain is normalized while the capital letters and +Tools tag in the local part remain. Provider-specific dot removal is never applied.
Errors and unsupported input
first..last@example.comRepair consecutive dots in the local part. Supply a single address without display names, angle brackets, or a comma-separated recipient list.
Continue this workflow
- Text to Unicode: Inspect unexpected Unicode characters in copied text.
Questions
Frequently asked questions
Will it merge Gmail-style aliases?
No. Dots and plus tags remain because alias rules vary by provider and may be important to the address owner.