What languages are supported?

JavaScript, TypeScript, Python, Java, C/C++, C#, Go, Rust, Ruby, PHP, HTML, CSS, JSON, XML, SQL, Bash, and more.

Is my code sent to a server?

No. All processing happens locally in your browser. Your code never leaves your device.

Free Online Code Diff Tool (No Signup)

Compare code with syntax highlighting and multiple diff views. Paste your original code on the left and modified code on the right, then click Compare. All processing happens locally in your browser.

How to Use This Tool

Paste your original code — Add the original version in the left panel (or click Load Sample to try it out).
Paste the modified code — Add the updated version in the right panel.
Click Compare — View highlighted differences with syntax coloring for 15+ languages.
Switch views — Toggle between side-by-side, unified, and inline diff modes using the tabs above the output.

Common Use Cases

What changed between two versions of my code? Paste both versions to see additions, deletions, and modifications highlighted line by line with syntax coloring.
How do I review a code change before committing? Compare your original and modified files side by side to catch unintended changes or verify your edits are correct.
How do I compare config files or JSON responses? Works with any text — paste two config files, API responses, or data files to spot differences instantly.