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Remove Duplicate Lines

Delete repeated lines and keep each one once.

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Paste a list and this tool removes duplicate lines, keeping only the first occurrence of each and leaving the order untouched. It is perfect for cleaning up email lists, keyword research, CSV exports and any list stitched together from several sources.

How to use the duplicate line remover

  1. Paste your list, one item per line.
  2. Duplicate lines are removed automatically, keeping the first of each.
  3. Copy the clean, de-duplicated list.

Keep your lists clean

Duplicates creep in whenever you merge sources — two exports of the same contacts, keyword lists from different tools, or a spreadsheet column copied twice. This utility scans line by line and drops any line it has already seen, so you are left with a unique set in the original order.

Get a clean, sorted, unique list

For a fully tidy list, chain a few tools: remove blank lines to clear the gaps, remove duplicate lines here, then sort lines alphabetically. Lowercasing first (with the lowercase converter) helps catch duplicates that differ only in capitalisation.

Frequently asked questions

Is the comparison case-sensitive?

Yes. Lines must match exactly, including capitalisation and spacing, to count as duplicates. Lowercase the text first if you want case-insensitive de-duplication.

Does it keep the original order?

Yes. The first occurrence of each line stays in place; only the later repeats are removed.

Will trailing spaces stop duplicates from matching?

They can, because the lines are then technically different. Run the text through Trim Whitespace first to avoid that.

Related tools

Remove Blank Lines
Strip out empty lines from your text.
Sort Lines
Sort lines A→Z or Z→A in one click.
Trim Whitespace
Collapse extra spaces and trim each line.
Line Counter
Count the number of lines in your text or code.