The hotqr.com mission is quite simple: just paste or write an URL or the text that you wanted in the home page edit box and then, automatically, the appropiate QR code image is generated, ready to be scanned from your smartphone.
Additionally you can install one of the Hot QR available browsers' extensions (see the below page menu) in order to get the QR code of the current browser's page just by made one click, that is, without need to visit the Hot QR page first.
Hotlinking is allowed in Hot QR! You can compose and URL like this: http://hotqr.com/image/My QR text here! and use that URL inside forums's or HTML IMG tags. Then the appropiate PNG image are shows with the right QR code!