Duplicate Line Remover
Remove repeated lines while preserving the first occurrence and original order.
Remove repeated lines while preserving the first occurrence and original order. Paste or type your text and the result updates instantly. Everything runs in your browser, so nothing is uploaded, nothing is stored, and there is no limit on how much text you can process.
What Duplicate Line Remover does
The first occurrence of each line is kept and later repeats are dropped, so your original ordering survives. Comparison trims leading and trailing whitespace but is otherwise exact, including letter case — lines differing by a single character are treated as distinct, because deciding otherwise is a judgement call no tool should make for you.
Your text never leaves your device
This tool is written in JavaScript and runs locally in the browser tab. No text is transmitted to a server, none is written to a log, and none is retained after you close the page. That makes it safe for drafts, client work and anything else you would rather not paste into an online form.
Why results can differ from other tools
Text processing involves judgement calls: what counts as a word, whether a hyphenated compound is one token or two, how a line ending is treated. Different tools resolve these differently, so a small discrepancy between this and a word processor is expected rather than an error.
Worked example
Run on a short sample so you can see exactly what changes before pasting your own text:
| Input | Output |
|---|---|
| banana apple banana cherry |
banana apple cherry |
Frequently asked questions
Does it keep the first or last duplicate?
The first occurrence is kept and later repeats are removed, so the original ordering of your list is preserved. Comparison ignores leading and trailing whitespace but is otherwise exact, including letter case.
Are near-duplicates removed too?
No. Only lines that match exactly after trimming whitespace are treated as duplicates. Lines differing by a single character, capitalisation or punctuation are kept, because deciding whether those are truly the same is a judgement call.
Is Duplicate Line Remover free to use?
Yes, completely. There is no account, no sign-up, no usage limit and no watermark. Every tool on this site runs in your browser and stays free.
Does my text get uploaded anywhere?
No. The processing happens locally in your browser using JavaScript. Your text is never transmitted to a server, never logged and never stored.