Paste two texts and instantly see the differences highlighted line by line or word by word. Your text never leaves your browser.
A diff checker compares two pieces of text and highlights what's different between them — showing added, removed, and unchanged lines (or words). It's the same concept as the diff command in Unix/Linux or the diff view in Git and code editors.
No. All comparison is performed entirely in your browser using JavaScript. Your text never leaves your device, making this safe for sensitive, confidential, or proprietary content.
Standard line diff marks entire lines as added or removed. Word-level diff goes further and highlights the specific words within a changed line that are different, making it easier to spot small changes in long lines.
Yes. Paste any plain text including source code, JSON, YAML, CSV, Markdown, or prose. The diff compares text line-by-line and is not language-aware, but the visual highlight makes differences easy to spot.