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This page is an online two dimensional code generator which is written in PHP. It can generate QR Code , Data Matrix , Aztec Code and Micro QR Code for the time being. Because QR Code is much more popular than the other code formats, it is separately named in the page title. If you need more information on two dimensional bar code systems, I strongly suggest that you take a look at Roger Smolski ‘s comprehensive blog on QR Code and two dimensional bar codes .