A QR code (short for Quick Response) is a specific matrix barcode (or two-dimensional code), readable by dedicated QR barcode readers and camera phones. The code consists of black modules arranged in a square pattern on a white background. The information encoded can be text, URL or other data.
Google offers a free QR Code Generation Tool. Follow these steps to use the tool:
1) Go to the Google QR Code Generation Tool
Now you can right-click on the on image to save to a location of your choice, and/or copy the URL code for use in your email or web site.