Decode QR codes an Internet service. Either upload an image of a QR code or point to a picture of a QR code via a URL reference.
Search online or in th appropriate app stores of the manufacturer of your mobile device for QR code reader applications. WARNING: Do not install the first best app you find, there are many on offer and the abilities and quality of these apps various enormousely!
Applications that can be run on desktop and laptop computers with the use of a webcam or other imaging device.
Professional and industrial handheld 2D barcode scanners capable of reading QR codes.
Handheld devices fall into two categories, simple and enhanced. The simple versions read the barcode data and pass the contents down the line to receiving application that then processes it.
Intelligent QR code hand scanners have an onboard OS (WinCE). Applications can reside on the scanner itself and using wifi or wlan, they can interact in real-time with a network service.
Pricing ranges vary widely, starting at around 100+ € up to 2000+ € per unit.