Clean up email lists, keyword lists, log files or CSV columns. The first occurrence of each line is kept, so the original order is preserved.
How to use the Remove Duplicate Lines
- 1 Paste your list, one item per line.
- 2 Choose whether "Apple" and "apple" count as duplicates, and whether to trim spaces.
- 3 Copy the de-duplicated list; the stats show how many lines were removed.
Worked examples
Input: seo tools SEO Tools keyword research seo tools
Result: seo tools keyword research
Case-insensitive: 2 duplicates removed
Tips
- Turn on trim whitespace so lines that differ only by trailing spaces are treated as duplicates.
- Turn off case sensitive for emails and keywords, where capitalisation is not meaningful.
- Need the list sorted as well? Use the Text Sorter with "remove duplicates" enabled.
Private by design
All processing happens in your browser. Your text is never uploaded, logged or stored on a server.
Frequently asked questions
Does it keep the first or last duplicate?
The first occurrence is kept and later repeats are removed, preserving the original order.
Can it handle large lists?
Yes — tens of thousands of lines are processed instantly in your browser.
Are blank lines treated as duplicates?
Yes, unless you tick "Remove empty lines", which drops them all.
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