Remove Duplicate Lines
Clean up your text by deleting repeated lines. Case-insensitive, whitespace-trim and sort options built in — everything runs locally in your browser.
What is the Remove Duplicate Lines?
The Remove Duplicate Lines tool cleans a list by keeping only unique lines. Compare case-sensitively or not, trim whitespace before comparing, keep the first or last occurrence, and optionally sort the result — with a live count of duplicates removed.
It handles lists with hundreds of thousands of lines and runs in your browser, so contact exports and customer lists stay private.
How to use the Remove Duplicate Lines
- 1Paste your list into the input box — one item per line.
- 2Choose options: ignore case, trim whitespace, keep first or last occurrence.
- 3Click "Remove duplicates" and check the removed count.
- 4Copy the cleaned list or download it as a .txt file.
Key features
- Case-sensitive and case-insensitive comparison
- Optional whitespace trimming and blank-line removal
- Keep first or last occurrence
- Optional alphabetical sorting
- Live count of duplicates removed
Frequently asked questions
Does the tool sort the output?
Only if you enable "sort alphabetically" — otherwise the original order is preserved.
Does trimming change my data?
Trimming affects only the comparison; kept lines retain their original whitespace unless you also enable trim-in-output.
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