ralfkrause Using the MoodleBox offline you can't generate qr codes with plugins using online generator tools like https://developers.google.com/chart/infographics/docs/qr_codes?hl=en . For those plugins the MoodleBox needs an online connection while the user opens the webpage with a generated qr code. For using the MoodleBox offline with qr codes you should install the Moodle plugin https://moodle.org/plugins/filter_filtercodes . With this plugin you can write some filtercode to get the qr code. The filtercodes plugin is programmed with a nice php library which generates the qr codes inside the MoodleBox.