Code Compare Tool
Compare two blocks of code line by line and see exactly what changed, in any language.
Compared line by line, live as you type, in any language — entirely in your browser.
What is Code Compare Tool?
Paste two versions of a code snippet — any language — and see a line-by-line diff, added lines in green, removed lines in red. Useful for a quick before/after comparison without opening a full diff tool. Because the comparison is plain line-by-line text matching rather than a language parser, it works identically for JavaScript, Python, config files, or any other text-based format — there's no language selector to get wrong. Everything runs in your browser, so pasted code snippets, including ones you'd rather not paste into a third-party diff service, never leave your machine.
FAQ
No — this is a plain line-by-line text diff, which works for any language since it doesn't need to parse the code, but it also won't recognize that a reformatted (but logically identical) block is "the same."
No — the diff is computed entirely in your browser using JavaScript. Nothing you paste is transmitted anywhere.
Yes, by default — a line that only differs in indentation or trailing whitespace is still flagged as changed, since the comparison is exact text matching rather than a syntax-aware diff.