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Duplicate Line Remover

Clean up lists with the Duplicate Line Remover. Paste text, drop repeated lines, and keep the order intact. Optional case-insensitive matching.

Remove duplicate lines

Paste your text. Duplicates are removed live.

Paste text above to begin.
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How deduplication works

Each line is compared against the lines already seen, and repeats are dropped while the original order is preserved. You can match case-insensitively, keep the last occurrence instead of the first, and choose whether blank lines count as duplicates.

Common uses

Writers dedupe keyword lists, developers clean log files and ID lists, and spreadsheet users tidy exported columns before pasting them back. Because order is kept, the cleaned list stays aligned with anything it was sorted with.

Dupe Line Remover FAQs

Does it sort my lines?
No. Order is preserved exactly; only repeated lines are removed. Use a sort tool first if you want alphabetical output.
What counts as a duplicate?
Identical lines. With case-sensitive matching, Apple and apple are different lines; with ignore-case they are duplicates.
Keep first vs keep last: what changes?
With keep first, the earliest copy survives. With keep last, the latest copy survives in the earliest position. Line count is the same either way.
Is there a size limit?
It handles hundreds of thousands of lines comfortably in a modern browser. Extremely large pastes may take a moment.
Is my text sent anywhere?
No. Everything runs locally in your browser; your text never leaves the page.
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