Paste two versions of Java code, or drop .java files, to see every change highlighted. Use it to review a class before a code review, compare decompiled output, or find what changed between two branches of a file. Diffspot highlights Java syntax, marks changed words inside each line and recognizes moved blocks. Press Try an example to see it on a real Java change.
How to compare Java files
- Paste or drop the original Java 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.
Java comparison tips
- Comparing JavaReordered imports produce a lot of noise. Diffspot's move detection recognizes them as moved lines, so real changes are easier to spot.
- Cut the noiseAnnotations like
@Overrideand generics are highlighted separately from types and keywords. - 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.
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Frequently asked questions
Is Java detected automatically?
Yes. Diffspot recognizes Java from the file name (.java) 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.