Compare two texts and instantly see what was added, removed or changed — side by side. Runs in your browser, nothing is uploaded. 🔍
Side-by-side comparison
Spot every change between two drafts, clauses, configs or code snippets in seconds.
Line-by-line, colour-coded: green = added, red = removed, so nothing slips through.
The comparison runs in your browser — your text is never sent anywhere.
A diff checker compares two pieces of text and shows exactly what changed between them — which lines were added, removed or kept. It's an everyday tool for developers reviewing code, legal assistants comparing contract drafts, writers tracking edits, and anyone who needs to find the difference between two versions of a document.
This tool uses a line-based comparison (longest-common-subsequence) and displays the result side by side with colour highlighting. Because it runs entirely in your browser, you can safely compare sensitive or confidential text with no upload and no sign-up.