Add Yahoo as a preferred source to see more of our stories on Google. You don't need your phone to open a QR code. You probably already know how to scan a QR code with your phone. It's simple enough: ...

Savvy iPhone users know what to do when they see a QR code in the wild. Open the Camera app, aim, and tap the link that gets revealed. But what about QR codes in images and PDFs that are already on ...