Remove Duplicate Lines
Remove duplicate lines from a list.
Overview
Removes repeated lines from a block of text, leaving one of each. Useful for cleaning up lists, logs, exports, and any text where duplicates have crept in. It runs in your browser.
How it works
The tool reads your text line by line and keeps the first time each line appears, dropping any later copies of the same line. The remaining lines stay in their original order. This makes it a quick way to deduplicate a list without sorting or rearranging it. The processing happens locally on your device. Options let you ignore case, so lines that differ only in capitalization count as duplicates, and trim surrounding spaces before comparing.
How to use it
- Paste your text, one item per line.
- The tool removes the duplicate lines.
- Read the deduplicated result.
- Copy the cleaned-up list.
Examples
Cleaning a list
Paste a list of emails with repeats and get a version with each address once.
Tidying a log
Strip repeated lines from pasted output to see the unique entries.
FAQ
Does it keep the order?
What counts as a duplicate?
Does it change the lines themselves?
Is my data uploaded?
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Open toolEmbed this tool
Paste this snippet to put the tool on your own site. It runs entirely in the visitor's browser, the same as it does here.