Developers, writers, and editors often need to see exactly what changed between two versions of a text or code. This free diff tool uses the Google diff-match-patch library in your browser: you paste the old text in the first box and the new text in the second. The tool compares them and highlights deletions in red and additions in green. No data is sent to any server; the comparison runs locally in a fraction of a second.

Use it for code reviews, document revisions, or any pair of texts you want to compare. The result updates as you type. Semantic cleanup is applied so that changes are grouped in a readable way. Ideal for spotting edits in contracts, scripts, or source code without leaving your browser.

A visual diff makes it easy to verify changes before committing or publishing. This checker is free, requires no sign-up, and works entirely in the browser. Use it for essays, config files, or any text or code where you need a clear before/after view.