If you need a QR code for a short URL created by urlBorg, just add ‘/qr’ at the end of it!

Here is how it works:
1. The short URL is http://ub0.cc/43/c
2. The QR code image is http://ub0.cc/43/c/qr and you can use it like this
<img src="http://ub0.cc/43/c/qr" />

Voila!

A side note: Since QR codes are expected to be used from a mobile device the link embedded in urlBorg QR codes will actually go to a urlBorg “preview” page (in the above example, http://ub0.cc/43/c/p). This makes it easier for users to use the “mobile version” link of the target page.