Code Diff Online
Compare source code files side by side and find differences instantly.
ORIGINAL1 lines
MODIFIED1 lines
What Is Code Diff?
Code Diff is a free online tool that compares two snippets of source code side by side, highlighting every added, removed, or changed line. It works with any programming language — JavaScript, TypeScript, Python, Go, Java, C++, Rust, and more — making it the perfect code comparison tool for developers.
How to Use Code Diff
- Paste your original source code into the left panel.
- Paste the modified source code into the right panel.
- Click Compare to view the highlighted diff.
- Toggle between Split and Unified view to review changes.
Features
- Works with any programming language
- Split and unified diff views
- Line number display
- Added / removed line counters
- Copy diff result to clipboard
FAQ
Which languages does Code Diff support?
Code Diff is language-agnostic — it compares any plain text, so it works with every programming language.
Is there a file size limit?
No server-side limits. Large files are processed entirely in your browser.
Can I use Code Diff to review pull request changes?
Yes. Paste the old version on the left and the new version on the right to get an instant diff.