QR Code size

A quick question about QR Code size came up today on Twitter, and it's certainly worth discussing. The size of a QR Code depends largely on the medium in which it is being communicated.

Sized correctly for the chosen medium

On a poster, it should be sized correctly so that it can be easily scanned from the position from which it will be viewed. On TV, it should be large enough to be scanned from the sofa. On a business card, the QR Code just needs to be of appropriate size so that a mobile phone's camera can focus on the detail.

It's important to remember that QR Codes become more complicated when holding more information, so a short web address creates a more simple QR Code. This simpler shape allows a QR Code of the same size to be scanned from further away.