Duplicate Line Remover

Clean your text lists by removing duplicate entries instantly. Sort and deduplicate emails, keywords, or data.

Removed: 0
How This Tool Works
100% Client-Side

Your data never leaves your device. All processing happens locally in your browser. No text is sent to any server, no data is stored, and no cookies track your usage.

Lines are split and added to a JavaScript Set data structure, which automatically ignores duplicates. Optional trimming removes whitespace before comparison. Optional sorting uses JavaScript's default alphabetical sort.

  • Uses Set for O(1) duplicate detection
  • Empty lines are filtered out automatically
  • Shows count of removed duplicates in real-time
How to verify this yourself

Check your browser's Network tab to see nothing is sent:

  1. Open DevTools: Right-click anywhere on the page → "Inspect" (or press F12)
  2. Go to Network tab: Click "Network" at the top of the DevTools panel
  3. Use the tool: Type or paste text and watch the Network tab
  4. Verify: You'll see no requests to external servers — all processing is local

Works in Chrome, Firefox, Safari, and Edge.