You might not think about them much. When you do, it might be to decry the invasion of robot vomit onto every ad, billboard and poster. Still, the humble two-dimensional QR Code — originally developed by a Toyota subsidiary to assist in automotive manufacturing — has become ubiquitous.
QR Codes can deliver almost any kind of digital data, as long as it fits within the code’s capacity; the densest versions of the barcodes can hold more than 4,000 ASCII characters, but most of the codes you see in public are much less info-packed. They’re ideal for short URLs, vCard contact info, …
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Three handy Mac tools for working with QR Codes