QR codes are more or less just a different way to represent text.
There a re a few different schema, but mostly a QR-code is used to print out a compute-readable way to write down something like an URL.
The largest QR-Codes with least amount of redundancy tops out at a few bytes under 3KB of content.
This is far from infinite, but on the other hand, close enough to never runs out for practical purposes.
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