Email Deduplicator

Deduplicate a local list using exact, domain-normalized, or fully case-insensitive comparison while preserving the first occurrence.

Email listComparison rule

ReadyEmail domain names are case-insensitive in normal use; local-part case semantics can depend on the receiving system, so the mode is explicit.

These tools work locally on text. Syntax validation is not mailbox verification: no DNS/MX lookup, SMTP connection, account-existence check, or deliverability test is performed.

How to use this Email Deduplicator

Remove duplicate email addresses with explicit local-part and domain case-handling rules. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.