Remove Duplicate Lines
Deduplicate line-based text while keeping the first occurrence.
Input is processed in your browser and is not uploaded.
Output
Results appear here.Unique lines: 0 · Duplicates removed: 0
This duplicate line remover is useful for cleaning keyword lists, logs, CSV columns, IDs, URLs, and copied spreadsheet values. It can preserve order or sort the final list. Lightweight, mobile-friendly, and built for quick repeat use.
Clean repeated line lists while preserving what matters
Duplicate lines appear in keyword exports, log extracts, URL lists, IDs, email snippets, and spreadsheet columns. This tool is designed for line-oriented cleanup where you need to remove repeated entries without losing the first useful occurrence or accidentally changing case-sensitive values.
Keyword and URL lists
Deduplicate research exports, crawl results, redirect lists, and copied spreadsheet rows before comparing or importing them.
Log and ID cleanup
Reduce noisy lists of request IDs, error names, or account references to the unique values that need investigation.
Order-sensitive review
Keep the first occurrence when sequence matters, or sort the final list when you need a stable output for comparison.
Clean without losing signal
- 1Paste one value per line and scan whether blank lines should count as values.
- 2Choose case sensitivity based on the source system, not visual preference.
- 3Preserve order when the first occurrence carries context from the original file.
- 4Copy the result only after checking the removed count against your expectation.
Line cleanup example
api/login
api/users
api/login
API/users
api/usersapi/login
api/users
API/usersWith case-sensitive mode, API/users remains distinct from api/users.
Review settings first
- Case-insensitive cleanup can merge values that some systems treat as different.
- Leading or trailing spaces can make two lines look identical while comparing differently.
- Sorting after deduplication changes the original sequence and may hide where a duplicate came from.
FAQ
Does it preserve the original order?+
Yes. By default the first occurrence stays in place and later duplicates are removed.
Can it ignore case?+
Yes. Turn off case sensitivity to treat lines like Apple and apple as duplicates.
Are blank lines removed?+
Blank lines are treated as lines, so repeated blanks are deduplicated like other values.