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Remove Duplicate Lines

Paste a list, click Remove Duplicates, and get a clean unique set back. No login, no data stored.

Remove Duplicate Lines

Common use cases

  • Clean up keyword lists — paste 500 keywords from multiple sources and remove overlap
  • Email list deduplication — remove duplicate email addresses before an import
  • Developer log analysis — find unique error messages from a repeated log file
  • URL lists — deduplicate scraped URLs before crawling or auditing
  • CSV column values — copy a column from Excel, deduplicate, copy back

The tool preserves the first occurrence of each line and removes all subsequent duplicates. The original order of unique lines is maintained (unless you enable sort).

Frequently Asked Questions

Yes, but only the comparison — not the output. With "ignore case" on, if your list has "Apple" and "apple", both are treated as duplicates. The first occurrence ("Apple") is kept in its original form. The output always preserves the exact text of the first occurrence of each unique value.
Any line that's empty or contains only spaces or tabs. With "Remove blank lines" and "Trim whitespace" both enabled, a line with just spaces will be treated as blank and removed. Without "Trim whitespace", a line with spaces is not blank — it counts as a line containing whitespace.
There's no hard limit set by this tool. The practical limit is your browser's memory — typically around 50–100MB of text. For very large files (100,000+ lines), the tool may take a second or two to process, which is normal. For files larger than a few MB, consider using a command-line tool like sort -u (Unix) or PowerShell's Get-Unique.