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Remove Duplicate Lines

Delete repeated lines from a list, with options to ignore case, trim spaces, drop empty lines and sort.

100% Client-Side

Paste a list with one item per line — duplicates are removed instantly, keeping the first occurrence.

How to use the Remove Duplicate Lines

  1. 1

    Paste your list, one item per line (emails, keywords, URLs, names…).

  2. 2

    Choose options: ignore case, trim spaces, remove empty lines or sort the result.

  3. 3

    See how many lines were kept and how many duplicates were removed.

  4. 4

    Copy the cleaned list or download it as a .txt file.

Frequently asked questions

The first occurrence is kept in its original position and later repeats are removed, so the order of your list is preserved unless you choose to sort it.

Only if you turn on Ignore case. With it on, the first spelling that appears is the one that's kept.

It removes spaces and tabs at the start and end of each line before comparing, so "item" and "item " count as the same line. The output uses the trimmed text.

Yes. Switch the output to Duplicates only to list each repeated line once, which is useful for finding double entries in a dataset.

Hundreds of thousands of lines work fine — the processing is a single fast pass in your browser and nothing is uploaded.

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