Remove duplicate emails

Remove duplicate email addresses from a list with one address per line. Domain names are compared without case; local parts stay case-sensitive unless you choose otherwise.

On your device · No account

Privacy details

Remove duplicate emails processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Your text

Options

Before the @ sign

Your result

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-19

Using Remove duplicate emails

Remove duplicate email addresses from a list with one address per line. Domain names are compared without case; local parts stay case-sensitive unless you choose otherwise.

Next: Extract emails

A worked example

The remove duplicate emails changes "a@example.com\na@example.com" becomes "a@example.com".

Next: Extract URLs

Before you use the result

The part before @ can be case-sensitive. This removes duplicates, not invalid or undeliverable addresses. A non-address line is reported instead of silently dropped.

Next: Extract numbers

Cite this page

Citation style

ToolOctopus. “Remove duplicate emails.” Updated 2026-09-19. https://tooloctopus.com/remove-duplicate-emails.

Add an access date if your instructions require one.

Citation formatting uses citeproc-js by Frank Bennett and Citation Style Language styles. Licence and source code.