Remove Duplicate Lines
Related external tools
Some links are affiliate links.
Related tools
Clean up any list of text in seconds: remove duplicate lines, sort them, trim stray spaces and drop blank lines. Useful for tidying email lists, keywords, log files and anything with one item per line. Everything runs in your browser and nothing is uploaded.
How to use
- Paste or type your text, with one item on each line.
- Turn the options on or off — remove duplicates, drop empty lines, trim spaces or ignore case.
- Pick a sort order if you want, then copy the cleaned result.
How it works
Your text is split into lines, then processed in order: each line is optionally trimmed, empty lines can be dropped, duplicates are collapsed to the first occurrence, and finally the list can be sorted. Sorting uses a natural order, so item2 comes before item10. In the example below, the two repeated lines are removed.
Features
Remove duplicates
Collapse repeated lines down to a single copy, keeping the first time each one appears.
Sort lines
Order lines A→Z or Z→A using a natural sort that handles numbers sensibly.
Drop empty lines
Strip out blank lines so the result is compact and easy to read.
Trim whitespace
Remove leading and trailing spaces from every line before comparing and outputting.
Ignore case
Treat lines that differ only in capitalization as the same when removing duplicates.
When to use it
Tidy lists
Clean up email addresses, names or word lists by removing repeats and sorting them.
Deduplicate logs
Strip repeated lines from log output or error dumps to see the unique entries.
Unique values
Paste a single column from a spreadsheet to get the distinct values it contains.
Keyword cleanup
Merge keyword lists from different sources and remove the overlaps in one step.
Notes
- When removing duplicates, the first occurrence of each line is kept.
- Sorting uses natural order, so numbers within text are compared by value.
- Leave sort on "Original" to keep the input order while still removing duplicates.
- All processing happens on your device; your text is never uploaded.
FAQ
- Does it only remove duplicates?
- No. Removing duplicates is just one option. You can also sort lines, drop empty lines, trim spaces and ignore case — use any combination.
- Is the original order kept?
- Yes, if you leave the sort on "Original". Duplicates are removed in place, keeping the first occurrence of each line.
- Can it ignore upper and lower case?
- Yes. Turn on "Ignore case" and lines that differ only in capitalization are treated as the same when deduping and sorting.
- Can it remove blank lines too?
- Yes. Enable "Remove empty lines" to strip out any blank or whitespace-only lines from the result.
- Is my text sent to a server?
- No. Everything runs locally in your browser and nothing you paste is uploaded.