A QR code (abbreviation for Quick Response code) is a specific matrix barcode (or two-dimensional code) that is readable by dedicated QR barcode readers and camera telephones. The code consists of black modules arranged in a square pattern on a white background. The information encoded may be text, URL, or other data.” (Wikipedia) This tutorial provides a QR Code generator and reader directly in the browser, implemented in JavaScript. Supported browsers: Firefox, Chrome and Opera