What is a QR code? A QR Code is a two-dimensional bar code, which has encoded in it a URL (web address), text, or other information(SMS,phone numbers,...etc). It can be read by a QR code scanner, including QR scanner smartphone apps. How can I read a QR code? If you have a smartphone, go to the app store and search for a QR code reader. You’ll find several free apps. Run the app and then hold your phone’s camera over a QR code to read it.