Question 1

What is CodeDiff Lab?

Accepted Answer

CodeDiff Lab is a free online code diff and merge tool that lets you compare code side-by-side with GitHub-style diffs, inline merge controls, word-level highlighting, and multi-file comparisons.

Question 2

How do I compare two code files online?

Accepted Answer

Paste your original code on the left panel and the modified code on the right panel. CodeDiff Lab will instantly show you a side-by-side diff with highlighted changes at the word level.

Question 3

Is CodeDiff Lab free to use?

Accepted Answer

Yes, CodeDiff Lab is completely free. It runs entirely in your browser with no sign-up required.

Question 4

Can I compare entire folders or directories?

Accepted Answer

Yes, CodeDiff Lab has a Folder Diff feature that lets you compare two directories side-by-side with per-file diff cards and change tracking.

Question 5

What programming languages does CodeDiff Lab support?

Accepted Answer

CodeDiff Lab supports syntax highlighting for all popular programming languages including JavaScript, TypeScript, Python, Java, C++, Go, Rust, HTML, CSS, JSON, and many more.

Side-by-side code review with guided merges

Side-by-side code review with guided merges