jsQR

Not at the moment but the scanning feature is client-side only and does not rely on any external services. It uses jsQR[0] to handle parsing directly in the browser. One way to use it and be sure would be to load the page and disable the site's network connection using developer tools before giving camera access. Once done, allow camera permission, perform the scan then kill the page. [0] https://github.com/cozmo/jsQR

I used https://github.com/cozmo/jsQR in production for years. Never had any problems, before all smartphones had built in QR readers, most of our users would use it primarily to interact with our product. Works for iOS and Android. To my knowledge does not use ZXing and is Apache Licensed.