Duplicate Line Remover – Free Online Text Deduplication Tool

Remove duplicate lines from any text instantly with this free online deduplication tool. Choose to keep only the first occurrence of each line, or remove every copy of a duplicated line entirely. Supports case-insensitive matching, whitespace trimming before comparison, blank line removal, and sorting. See a live count of how many duplicates were found and removed. All processing runs in your browser — your data never leaves your device.

Options

Removal Mode

Sort output

Input
Output

How to Use the Duplicate Line Remover

Features:

  • Keep only the first occurrence of each duplicated line.
  • Remove all copies of duplicated lines entirely.
  • Case-insensitive matching and whitespace trimming options.
  • Live count of duplicates found and removed.

How to use:

  1. Enter your text in the Input area.
  2. Configure options such as case-insensitive matching and trimming.
  3. View instant results in the Output area.
  4. Click Copy to copy results, or Clear to start over.

Tips:

  • All processing runs entirely in your browser — your data never leaves your device.
  • Works instantly with no server requests or API calls.