Diff Checker
Compare two texts and highlight changes.
Diff Checker is a free, browser-based tool on Toolery. Compare two texts and highlight changes. Everything runs locally on your device, so it's fast and completely private — no uploads, no queues, and no sign-up to try it.
Diff Checker — FAQ
Is Diff Checker free to use?
Yes. Diff Checker is completely free on Toolery — no watermarks and no sign-up required to try it.
Is Diff Checker private — do my files stay on my device?
Yes. Diff Checker runs entirely in your browser. Your files and input are processed on your own device and never uploaded to a server, so nothing is stored, seen, or shared.
How do I use Diff Checker?
Compare two texts and highlight changes. Open the tool, add your file or input, and get the result instantly — it all happens on your device.
Does Diff Checker send my data anywhere?
No. Diff Checker runs entirely in your browser — your input never leaves the tab, which makes it safe for code, tokens, and other sensitive data.