QR code

= Quick response. The QR code was originally developed for applications in automotive production by the Japanese company Denso Wave Incorporated.

A QR code image consists of a two-dimensional square with a pattern made of black and white areas. Texts or hyperlinks (internet addresses) are translated in the QR code whereby 4,296 alphanumeric characters can be coded. With a smartphone, that has a camera and QR reading software, the QR code can be photographed, decoded using the reading software and trigger actions in the smartphone. Some reading software for QR codes is available for free from various suppliers for various smartphone models.


A common field of application is requesting an internet address in a web browser or the telephone module. A well-known example for the use of QR codes are online rail tickets. The advantage of a QR code is that the information does not need to be manually written or typed.

QR code example

Technical terms for Q