Remove Duplicate Lines
Paste a list with one item per line and press Remove duplicates. The first occurrence of each line is kept in its original position and later repeats are dropped. The result shows how many lines were kept and removed.
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Matching rules
Lines match when they are identical after the options are applied. Trimming removes spaces and tabs at both ends; ignore case compares lowercase versions but keeps the original spelling of the first occurrence.
Privacy
Your text is processed by a Web Worker inside the isolated tools.freetoolspro.com frame. It is not uploaded, logged or shown to advertising scripts on this page, and it is gone when you close the tab.
Common questions
Does it sort the list?
No, order is preserved. Use Sort Lines if you also want it sorted.
Can it handle CSV rows?
Yes, each row is treated as one line of text.
Methodology reviewed 2026-10-27. Processing details and test approach.