Developer Tools
Text Diff Checker
Compare two texts side by side and see exactly what was added, removed, or changed. Line-by-line diff with color highlighting.
Free · Runs in your browser · No signup · Files stay on your device
Paste text into one or both boxes, then compare the changes.
How to use
How to use Text Diff Checker
- 1Paste the original text in the left box.
- 2Paste the modified text in the right box.
- 3Click 'Compare' to see the differences highlighted.
Tips
Quick tips
- Green lines = added in the modified text.
- Red lines = removed from the original text.
- Useful for comparing code, configs, documents, and data.
FAQ
Frequently asked questions
What algorithm is used?
A longest common subsequence (LCS) based diff algorithm that compares text line by line — similar to what Git uses for showing changes.
Can I compare files?
Paste the file contents into the text boxes. The tool handles text comparison — for binary files, use a dedicated diff tool.
Is there a size limit?
No hard limit, but very large texts (100,000+ lines) may be slow since the diff runs in your browser. For most practical uses, it's instant.
Is my data sent to a server?
No. All comparison happens locally in your browser.
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