diff checker
Instantly compare two text files or code snippets to find differences. A fast, free, and secure online diff tool for developers.
Getting Started in Seconds
Input Texts
Paste your original text in the left box and the modified version in the right box.
Choose View
Select between 'Split' view for side-by-side comparison or 'Unified' view for a single stream.
Analyze
Review the highlighted differences: green for additions and red for deletions.
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Common
Questions
Have a different question about Diff Checker? Feel free to reach out or explore our other documentation.
1Is it really true that my text stays on my computer?
Yes, that's exactly how it works. We use 'client-side' processing, which is like have a private notepad. Your original text and the resulting comparison never leave your browser for any reason, keeping your data 100% private.
2Can it compare code files like JSON or HTML?
Imagine you're trying to find a tiny bug in a giant block of code—manual checking is practically impossible. Our tool handles everything from source code and JSON to HTML and plain text, highlighting every single change in seconds.
3Is there a limit to the text size I can compare?
Have you ever tried to compare two massive documents and had your browser freeze? Our tool is optimized for performance, so you can compare thousands of lines instantly. The only limit is your device's memory.