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Remove Duplicate Lines

Delete repeated lines from a list, keeping the first occurrence of each unique line.

To remove duplicate lines, paste your list above. The first occurrence of each unique line is kept and later repeats are dropped. You can match case-insensitively and optionally sort the result alphabetically instead of preserving the original order.

Runs in your browser
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Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Does removing duplicates preserve order?

Here, yes — the first occurrence of each line keeps its position. That matters when the order carries meaning, such as a log or a priority list, where sorting to deduplicate would destroy the information.

Why do lines that look identical not match?

Usually trailing whitespace, or different line endings if the text came from two sources. Case differences are the other common cause, which is why case-insensitive matching is offered separately.

How to use the remove duplicate lines

  1. 1Enter or paste your lines.
  2. 2Turn "Case sensitive" on or off as needed.
  3. 3Turn "Keep original order" on or off as needed.
  4. 4The result appears immediately — copy or download it.

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