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Paste or open both versions and read the difference line by line — side by side or unified, with the changed words marked inside each line. It’s a real diff, the same algorithm your version control runs, and the output copies as a standard unified diff. Everything happens in your browser; neither text leaves this page.
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Paste text, or open a file from your device.
The diff appears as soon as both sides have text.
Paste into the editor or open a file — everything you add stays in this tab, and you see exactly what the tool will work on before anything runs.
Your browser does all the work locally. Nothing is uploaded — what you paste never leaves this tab, so there’s nothing for anyone to store, scan, or leak.
Take the result to your clipboard, or save it as a file. Close the tab and nothing of what you pasted remains.