File Diff Checker
Compare two text files and see the differences visually. Upload files or paste text directly. Added lines are shown in green, removed lines in red.
Click to upload Original File
or drag and drop
Click to upload New File
or drag and drop
Difference Output
Why use this tool?
Comparing files manually is time-consuming and error-prone. This diff checker instantly highlights changes between two versions of a file, making it perfect for code reviews, document comparisons, and tracking changes.
- Visual comparison — See additions in green and removals in red.
- Line-by-line analysis — Compare files line by line for precise results.
- Multiple input methods — Upload files or paste text directly.
- Privacy-focused — All comparisons happen in your browser. No data is stored or transmitted.
- Free and unlimited — No sign-up, no limits, no ads.
How to use
- Upload two files using the upload boxes, or paste text in the text areas.
- Click Compare to see the differences.
- Review the highlighted output showing what was added and removed.
- Use Swap Files to reverse the comparison, or Clear to start over.
Frequently Asked Questions
Yes, completely free with no sign-up required. All comparisons happen in your browser.
The tool works best with text-based files like .txt, .md, .json, .xml, .csv, code files (.js, .py, .java, etc.), and log files.
No. Everything runs client-side in your browser. Your files never leave your device and are not stored anywhere.