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Traditional online diff tools require you to upload your source code or sensitive documents to their servers. KV File Viewer & Diff changes that by performing all calculations locally in your browser. Your data never leaves your device, making it safe for proprietary code, logs, and confidential text.
Switch to the "Compare Files" tab, upload your original and modified files, and click "Compare". Our engine will compute the difference using a high-performance LCS algorithm and display them side-by-side with clear color highlighting.
You can view and edit any text-based file, including .txt, .js, .ts, .json, .html, .css, .md, .py, .java, .xml, and more. Syntax highlighting is automatically applied based on the file extension.
Yes. Once the page is loaded, you can disconnect from the internet. All file reading, editing, and diffing logic is self-contained and runs in your browser.
For optimal performance, especially on mobile devices, we recommend files up to 10MB. Larger files might cause the browser to slow down due to memory constraints.
Absolutely. The editor is designed to be mobile-friendly, with responsive layouts for both editing and viewing differences.