Remove Duplicate Lines | How to use and interpret results
Keep the first occurrence of each repeated line and count removals. A separate trim option lets you decide whether copied leading and trailing whitespace should also be cleaned.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Paste one item per line and choose trimming. Letter case remains significant, so normalize case first if differently capitalized English words should be merged.
Results and examples
Lines A, A and B leave A and B. With trimming enabled, a line containing A followed by a space is cleaned to A and treated as the same entry.
Worked example
Lines A, A and B leave A and B. With trimming enabled, a line containing A followed by a space is cleaned to A and treated as the same entry.
Limitations
- Similar meanings and spellings are not inferred as duplicates.
- Trimming changes the output text itself, not only the comparison key.
Fields
| Field | Guidance and constraints |
|---|---|
| Text | Check the unit and format displayed beside this field. |
| Trim spaces before comparing | Check the unit and format displayed beside this field. |
| Result (keep first occurrence) | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Are two A lines with different trailing spaces equal?
Lines A, A and B leave A and B. With trimming enabled, a line containing A followed by a space is cleaned to A and treated as the same entry.
Does trimming affect only comparison?
Similar meanings and spellings are not inferred as duplicates. Trimming changes the output text itself, not only the comparison key.
