Best Free Remove Duplicate Lines
Strip duplicate lines from any list in your browser, with case and whitespace options.
100% free
No signup
No watermark
Files processed in memory, never stored
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How it works
- Paste your lines. Drop your list or text into the box, one item per line.
- Set matching options. Open Advanced options to ignore case or whitespace if needed.
- Remove and copy. Hit Remove duplicates, see how many were removed, and copy the result.
About this tool
Paste a list or block of text and strip out the repeated lines in one click — handy for deduping email lists, log lines, CSV rows, keyword exports or any line-separated data. The tool keeps the first occurrence of each line and removes the rest, and it tells you how many duplicates it pulled out. Advanced options let you match case-insensitively, ignore stray leading/trailing spaces, and switch to removing every copy of a duplicated line.
What people use it for
- Dedupe an email or subscriber list
- Clean repeated rows out of a CSV or export
- Collapse duplicate log lines before analysis
- Tidy a keyword or URL list down to unique entries
Frequently asked questions
By default it keeps the first occurrence of each line and removes the later duplicates. To keep only lines that appear exactly once, turn on "Remove every copy of a duplicated line" in Advanced options.
Yes. Enable "Ignore case" in Advanced options and "Apple" and "apple" are treated as the same line.
The "Ignore leading/trailing spaces" option (on by default) trims each line before comparing.
No. The remaining lines stay in their original order — it simply drops the duplicate ones. Use the Sort Lines tool to also order them.
No. Everything runs locally in your browser, so the text you paste never leaves your machine.
Completely free, no account and no limits — a client-side tool with nothing to meter.
Yes. It runs in your browser, so Remove Duplicate Lines works on phones and tablets as well as desktop — there is no app to install.
Usually just a few seconds for a typical file — Remove Duplicate Lines starts working the moment you give it your input.
Casual use is unlimited, under a generous fair-use cap that keeps it fast for everyone.
All modern browsers — Chrome, Safari, Firefox and Edge. Remove Duplicate Lines needs nothing installed beyond the browser you already use.