QR Code Generator/Reader
A QR Code is a matrix code (or two-dimensional bar code) created by Japanese corporation Denso-Wave in 1994. The "QR" is derived from "Quick Response", as the creator intended the code to allow its contents to be decoded at high speed.
Here I created a PHP script using Google API to generate QR code from text and also a QR reader.
Google Chart API
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Google chart API has so many useful stuff and one of them is the QR generator, here is an easy way to generate a desired QR Code;
http://chart.apis.google.com/chart?cht=qr&chl=your+text+here&chs=186x186
You can copy the code and paste it on your browser address bar and instantly the Google chart API will generate a QR encoded representation of your text.