The Google Chart API now generates QR Codes.
For example, the following URL results in the QR Code for https://brentlogan.com/.
http://chartserver.apis.google.com/chart?
cht=qr&chs=300x300&chl=https://brentlogan.com/
Note, the above list URL is shown on two lines for space reasons only. It should be one continuous URL with no spaces.
Interestingly, the <img> form to embed the resulting QR Code in a web page does not (yet?) work. I guess that’s to be expected when using an undocumented feature of the API.
Update: The following now works:
<img src="https://chart.googleapis.com/chart?chs=100x100&cht=qr&chl=https://brentlogan.com/" />
resulting in the image below:
Hat tip: 2d Code via Josh Bancroft’s linkblog.