If I have to pull out my mobile device to read QR codes, I want an app that’s fast, locks on, and scans codes quickly without any fuss. While there’s a plethora of QR code scanners on the App Store, ...

They also hold limited information, and the code itself can be damaged if printed; accumulation of dust and dirt can prevent the scanner from reading it. Many smartphones have built-in QR readers.

Recommended apps include “QR Code Reader,” “Lightning QR Scanner,” and “QR & Barcode Scanner (Plus).” Inadequate lighting, ...

The first time you scan a QR code you'll need to enable the feature in the app's Settings menu. After that, you can skip this step and simply launch the QR reader. 1. Start the Samsung Internet app.