Duplicate Line Remover
1.
Paste your text into the input area
2.
Toggle case-insensitive matching or whitespace trimming as needed
3.
The deduplicated result appears instantly - copy it from the Result panel
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Removing duplicate entries from a list of names, IDs, or URLs
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Cleaning up log output or export data
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Deduplicating mailing lists before importing them
Does order matter?
The first occurrence of each line is kept; all subsequent duplicates are removed. The original order is preserved.
Is the comparison case-sensitive?
By default yes, but you can enable case-insensitive mode so "Hello" and "hello" are treated as duplicates.
What does the trim option do?
When enabled, leading and trailing whitespace is stripped before comparing and in the output, so " foo " and "foo" are treated as the same line and the deduplicated result contains trimmed lines.
Is my text sent to a server?
Everything runs in your browser. No data is uploaded or stored.
Can I use this on CSV or TSV data?
Paste any line-based text format. Each line is treated as one entry regardless of its content.