Paste two versions of C++ code, or drop .cpp, .cc, .hpp and .h files, to see every change highlighted. Use it to review a change to a class or template, or compare two versions of a header. Diffspot highlights C++ syntax, marks changed words inside each line and recognizes moved blocks. Press Try an example to see it on a real C++ change.
How to compare C++ files
- Paste or drop the original C++ code on the left.
- Paste or drop the changed version on the right. The diff updates as you type.
- Jump between changes with F7 and Shift+F7, or switch to Unified view to read it like a pull request.
- Copy or export a unified diff, a .patch file or an HTML report.
C++ comparison tips
- Comparing C++Templates, raw strings and preprocessor lines are highlighted correctly.
- Cut the noiseWhen a reformat changed indentation everywhere, Ignore changes in whitespace shows only the real edits.
- Your code stays privateThe comparison runs on your device in WebAssembly. Proprietary code is never uploaded or stored.
- Fast on large filesFiles with hundreds of thousands of lines compare in about a second.
Advertisement
Frequently asked questions
Is C++ detected automatically?
Yes. Diffspot recognizes C++ from the file name (.cpp, .cc, .hpp and .h) or from the code itself. You can also choose it in the Syntax menu.
Is my code uploaded?
No. The page loads the diff engine once; after that your code stays in the browser tab. How Diffspot works explains how you can check this yourself.
Can I get a patch file?
Yes. Export → Download .patch creates a standard unified diff that git apply or patch can apply.