Diff Pro

100% in your browser · data never leaves your device

Compare two blocks of text line by line — unified diff, side-by-side view and stats, all computed locally in your browser. The paid API endpoint for agents is at POST /api/diff-pro.

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Unified diff 

  


  

    Side-by-side
    

  



    
How to use
  1. Paste the original text in the left pane and the changed text in the right pane.
  2. Pick a view: unified diff, side-by-side, or stats only.
  3. Toggle ignore-whitespace / ignore-case when noisy formatting hides real changes.
  4. Click <strong>Compare</strong> and copy the result or download it as a .diff file.
Where it applies
  • Reviewing config or code changes before a commit.
  • Checking what changed between two API responses.
  • Producing a clean patch for a bug report or ticket.
  • AI agents diffing documents through the paid <code>POST /api/diff-pro</code> endpoint.