Paste two versions of text or upload files to see added, removed, and unchanged lines in a git-style diff view.
Upload original file
Drag and drop a text file here, or click to choose one
Upload updated file
Drag and drop a text file here, or click to choose one
Large files automatically fall back to limited or summary mode.
The diff algorithm runs in a Web Worker inside your browser, so the page stays responsive even for large files. The text you compare is never sent to a server.
All diffing is done locally using browser APIs. The content you paste or upload never leaves your browser tab — no server receives it at any point.