Compare two texts, documents or code snippets line by line. Added, removed and unchanged lines are color-coded instantly — and your data never leaves your browser.
Paste two versions and click Compare.
A diff is a line-by-line comparison of two versions of a text — code, config files, documents, logs. The checker highlights added (green), removed (red) and unchanged lines, so you can see exactly what changed between revisions in seconds.
Developers use diffs to review code changes before merging, compare config files between environments, or track what an editor or script modified. Writers and editors compare draft versions, and analysts compare exported reports or CSV snapshots. A fast, private diff checker saves the pain of reading two documents side by side.
Yes. Everything runs in your browser with JavaScript. Your text is never uploaded, stored or logged — the tool works even offline after the page loads.