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Text Diff Checker
Compare two texts side-by-side and highlight every difference line by line. Split and unified views. Copy unified diff. Runs entirely in your browser — no uploads.
Developerdiffcomparetextdifference🔒 Browser-only
📋 How to use Text Diff Checker
- 1Paste the original text in the left panel
- 2Paste the changed text in the right panel
- 3Differences are highlighted instantly — added lines in green, removed in red
- 4Switch between split view and unified view
Try it now
Paste text in both panels above to see differences highlighted line by line.
All comparison happens in your browser — nothing is sent to any server.
Examples
Compare code versions
Input: "Original function vs refactored function"
Output: "Changed lines highlighted with +/- markers"
Check document edits
Input: "Draft v1 vs Draft v2"
Output: "Every addition and deletion shown"
Frequently Asked Questions
Is my code or text uploaded?▾
No. All comparison happens in your browser using a local LCS algorithm. Nothing is sent to any server.
What is the maximum text size?▾
Up to ~2000 lines per side without performance issues. Very large files (10K+ lines each) may slow down due to the O(n×m) LCS computation.
Can I compare files?▾
Paste file contents directly into the text areas. For binary file comparison, use a desktop tool like git diff or Beyond Compare.