This is a standard Joomla! article. The 2 codes below are displayed using the Joomla! { loadposition ... } functionality. These are both quite complicated QR Codes because they hold quite a bit of information - the more complex the code, the larger it should be so smart devices can 'scan' the codes easier.
As you can see below, the 'vCard with Photo' QR code is the MOST complex - the photo is encoded right into the code using base64_encoding. The QR image must be very large in order to scan...
End of article here. Below are 4 additional module examples...