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Could you read the left image?
Probably not ...
But your cellphone may understand it!

The above 2D barcode image is a QR Code example. The QR Code is a de-facto standard for Japanese cell phones to read barcode images, and it's used to encode numbers (up to 7,089 digits), texts (up to 4,296 characters), URLs, images and songs. Th QR Code was created by Japanese corporation Denso-Wave in 1994, and this standard is in the public domain. For more information, please refer to QR Code Official Site.

In the past, it required the special desktop softwares to generate QR Codes. However, with the helps of new Google Chart API, to generate QR Codes on the web seems can not be easier. In this article, I implemented a simple Javascript object qrcode.js wraps around Google Chart API. The users can encode texts into QR Codes with simple Javascript functions. Here are two demonstrations:

Simple QR Code HTML
QR Code Online Generator:
QR Code Text :
QR Code Size : (image pixels)

The final question is "how to verify QR Codes created here?". The users can use either QR Code readers or cellphones to verify the results. Also, Google offers a QR Code reader library, Zebra Crossing (ZXing), for free. The users can use ZXing Decoder Online to verify QR Codes.