How it works
Dedup keeps one copy of each exactly-identical line and removes the repeats, with surviving lines staying in their original order. It is a single, predictable operation: your text minus the duplicates, nothing else changed.
Matching is strict and literal — case, spaces, and punctuation all count. Near-duplicates like typos or differently-cased words are treated as distinct lines, which keeps the tool's behavior fully predictable.
Your data and text
Your text is processed entirely in your browser and never uploaded, stored, or logged anywhere. Closing the tab ends the session completely — there is no copy of your list left behind on any server, because no server was ever involved.
The tool does not modify your original: it produces a cleaned result for you to copy or download. Keep your source text until you have verified the result, especially for lists you cannot easily regenerate.
Limits and edge cases
There are no practical limits: lists with tens of thousands of lines clean up in seconds, and you can use the tool as often as you like. Extremely large pastes are bounded only by your browser's memory, which handles far more text than any realistic list.
Blank lines are lines too — repeated blank lines collapse like any other repeats. If your formatting depends on blank-line spacing, check the result and re-add spacing where it matters.
About the tool itself
The dedup tool is completely free with no account, no watermarks, and no usage caps. It runs in any modern browser on desktop, tablet, or phone, with the interface available in 15 languages.
Because everything happens locally, the tool keeps working even if your connection drops after the page loads. There is nothing to install or update — you always get the current version automatically.
More questions, quick answers
Wondering about a specific situation? The rule of thumb covers nearly everything: if two lines are character-for-character identical, one survives; everything else passes through unchanged. Test edge cases on a copy of your text — dedup is instant and free, so experimenting costs nothing.
For recurring list cleanups, the tool rewards routine: same preparation, same verification counts, same delivery step. What feels like a chore the first time becomes a one-minute habit by the fifth. Write the routine down once and it outlives your memory of it.
And when results surprise you — too many or too few duplicates removed — the input is almost always the explanation. Check for trailing spaces, mixed case, or header rows before suspecting the tool; the tool does exactly one predictable thing.
Frequently asked questions
What exactly counts as a duplicate?
A line that is character-for-character identical to another line — including case, spaces, and punctuation. Near-duplicates like typos are not treated as duplicates.
Does dedup reorder my list?
No. Each unique line keeps its original position; only the extra copies are removed.
Is there a size limit?
No practical one. Even lists with tens of thousands of lines process in seconds, and usage is unlimited.
Is my text private?
Yes. Processing happens entirely in your browser — your text is never uploaded, stored, or logged.