Because they are free to generate, it means that almost anyone with a computer (or even a smartphone) and a little confidence can make them. Once that is done, the sky is the limit on what you can do with them.
If you are looking for a little inspiration, here are 20 creative ideas. If you are still a little confused about the whole QR code thing, take a look at this easy to understand explanation about the barcode-looking black squares.
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