Remove Duplicate Lines
Strip repeated lines, optionally ignoring case and trimming space.
How to use the Remove Duplicate Lines tool
- Enter your duplicates in the fields above.
- Adjust any slider or type an exact number — the answer updates as you go.
- Copy the result and close the tab. Nothing you entered was sent anywhere.
About the Remove Duplicate Lines tool
Pastes are compared line by line; the first occurrence is kept and later duplicates are removed. Options ignore letter case and trim surrounding whitespace before comparing.
This is the fastest way to clean a merged list of emails, IDs or URLs before importing anywhere.
Everything runs locally in your browser: no data is uploaded, no account is needed, and it works offline once the page has loaded.
Embed this tool
Customize and copy an iframe. Linking back helps both sites.