Diff Checker Online — Compare Text & Code
Compare two text files or code snippets side by side with highlighted differences.
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Frequently Asked Questions
How do I compare two text files online?
Paste the original text on the left and the modified text on the right. Our diff tool highlights additions (green), deletions (red), and changes between the two texts.
What diff algorithm is used?
We use the Myers diff algorithm which provides optimal edit distance calculations for accurate, line-by-line difference detection.
Can I compare code files?
Yes, paste any code (JavaScript, Python, JSON, SQL, etc.) into both panels to see exactly what changed. Perfect for code reviews and debugging.
Is there a file size limit?
There is no hard limit. The tool handles large text files efficiently since all processing happens in your browser.