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Remove Duplicate Lines

Remove duplicate lines from text.

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chars words sentences lines

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Result

About Remove Duplicate Lines

Remove duplicate lines from a list while preserving the original order. Configure case sensitivity, whitespace trimming, and blank line removal.

How It Works

The tool tracks each unique line using a hash set. When a line has been seen before, it is removed from the output. Comparison can be case-sensitive or case-insensitive, and leading/trailing whitespace can be trimmed.

Step by Step

  1. 1 Paste your list with duplicate lines
  2. 2 Choose comparison options (case sensitivity, trimming)
  3. 3 Click Remove Duplicates
  4. 4 Copy the deduplicated result

Tips

  • Enable 'Trim whitespace' to catch lines that differ only by spaces.
  • Original order is always preserved — the first occurrence is kept.

Frequently Asked Questions

Which duplicate is kept?
The first occurrence of each line is always kept. Subsequent duplicates are removed.