Project Nayuki has a site that explains how to create QR codes, the codes that you can aim your phone or camera at to get certain types of text, web URLs, etc.
This JavaScript demo application visualizes in detailed steps, how a text string is encoded into a QR Code barcode symbol. The content of this page essentially explains and justifies how my QR Code generator library works internally.
Also see Wikipedia – QR code – Design.
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