https://www.qrstuff.com/

1. http://www.qrcode-monkey.com/
2. Google has a "simple" way to make a QR code for anything you want. Paste this in your web browser:

   https://chart.googleapis.com/chart?chs=150x150&cht=qr&choe=UTF-8&chl=http://reddit.com

   https://chart.googleapis.com/chart?chs=150x150&cht=qr&choe=UTF-8&chl=Hello+World

   just replace everything after the "chl=" with whatever you want your QR to say

3. add ".qr" to the end of any goo.gl shortened link to get a qr code to the shortened link
4. https://www.qrstuff.com/