QR Codes can be created from a desktop computer using QRStuff.com - QR code generator (with URL shortener) or QR Voice - Text to speech QR code generator or Vocaroo.com - Create short audio recordings. Add pictures to your QR code by using Visualead or SnippQR.
To view a QR Code on a device, you will need a reader, like i-nigma.
From iTunes (Apple): https://itunes.apple.com/app/i-nigma-4-qr-datamatrix-barcode/id388923203?mt=8
For Google Play (Android): https://play.google.com/store/apps/details?id=com.threegvision.products.inigma.Android
To get a QR reader for your desktop, go here: http://dansl.net/qrreader/
"QR or Quick Response Codes are a type of two-dimensional barcode that can be read using smartphones and dedicated QR reading devices, that link directly to text, emails, websites, phone numbers and more!" - from What is a QR Code? at www.whatisaqrcode.co.uk/
QR codes can be used in ANY subject area for many purposes.
* Showcase a writing assignment
* Math practice
* Homework/classwork notes
* Link to a Google Form for a quiz/survey
* Audio directions
* Student pictures
* Book Talks to put on library books or in newsletters
* Videos of the classroom
* Bookmark websites
Click for more ideas!