My go-to QR code generator has always been QRStuff, but I've discovered some new sites that have really piqued my interest:
1. QR Treasure Hunt Generator
This site is the only site you'll need to create your own QR Code Treasure Hunt for any subject. Type your questions and answers, generate a QR code with the tool provided, and display the codes around your classroom and even your school.
This is Google's version of a URL shortening tool (like bitly and ow.ly). Use goo.gl to shorten a website link and a QR code automatically gets created for you! To find the QR code, click the "details" link after you make your abbreviated URL. You'll also learn how many times your link has been used. This would be useful to count the number of students who've followed the link or QR code.
3. QR Voice
QR Voice lets you to create QR codes that play an audio message when scanned. Record a message or type it in 100 characters or less. I'd like to try this with student feedback!
How are you using QR codes in the classroom? If you haven't yet explored the possibilities but want to try it out, I'd recommend beginners start here and those who are more experienced with QR codes check out this site.
For fun, scan the QR code in the photo and see where it takes you!