The app comes with a built-in document scanning feature, alongside many others, and it will most likely be powerful enough to ...

If the barcode icon is not visible ... place the QR code in front of the camera on your computer, and the Camera app will scan it for you. Press the link displayed at the bottom of the Camera ...

If you don't have a scanner at home, it can be annoying to try ... scanning feature that's buried inside the iPhone Notes app. You can even turn them into PDFs and share them.