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About

Runs locally in your browser

Remove Duplicate Lines

Remove duplicate lines from lists, logs, and exports. Keep the first or last match, optionally sort, and copy a clean list locally.

Paste a mailing list, a log dump, or a column from a spreadsheet when the same row appears twice. This tool uniques lines, it does not rewrite wording.

Matching and filtering happen in the browser. Nothing you paste is stored on a server.

How to use

  1. Paste the list, one item per line.
  2. Choose keep first or keep last, plus case sensitivity and optional sort.
  3. Copy the unique lines.

How it works

By default the first time a line appears is kept. Switch to last if a later revision should win.

Turn off case sensitivity to treat Hello and hello as the same line. Sort applies after duplicates are dropped.

Examples

  • Email list

    A newsletter export with the same address on three rows keeps one row and drops the repeats.

  • Build log

    Repeated warning lines collapse so you can scan unique messages from a noisy compiler log.

FAQ

Are blank lines treated as duplicates?

Yes. Repeated empty lines collapse to a single blank line if they match.

Does order stay stable?

Yes when sort is off. Keep first preserves original order of first sightings.

Is matching whole-line only?

Yes. Partial overlap inside a line does not count as a duplicate.

Does text leave my machine?

No. Deduping runs in this browser tab.

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