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Code Diff Checker

Compare two code blocks. Highlight differences like a mini Git diff.

Input
Paste your old and new code. Click Compare to see the diff.

Code Diff Checker

Compare two code blocks and highlight differences—like a mini Git diff. Paste your old and new code. See exactly what changed: added lines (green), removed lines (red). Switch between unified view (single list) or side-by-side view. Perfect for code reviews, debugging, or comparing configs.

How to Compare Code

  1. Paste the old version in the "Old" box and the new version in the "New" box.
  2. Click "Compare" to see the diff with highlighted changes.
  3. Use "Unified" or "Side by side" to switch views. Copy the diff if needed.

When to Use

Compare before/after refactoring, review config changes, check API response differences, debug file edits, or document changes. Works with any text: code, JSON, config files, or plain text. All in your browser—no uploads.