Explain to me how QR codes work

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I understand the code itself is a different make up of black/white grids to get your phone to recognize a linked site. But at some point won’t we completely run out of possible image combinations making them obsolete or is it something that regenerates a new site to QR connection? (On mushrooms so I might not have asked this very well lmao)

Basically will we run out of QR codes and if not how is there an endless supply?

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10 Answers

Anonymous 0 Comments

Answering the “can we run out of qr codes” part.

Could we? Yes. How many combinations are there? Yes.

There are bigger qr grids, different encoding methods, different ways to do error correction… So you can create different qr codes that contain the same data after coversion.

There are also useless qr codes: like creating a code for the text AAAAAAAAAAAAAAAAAA. So there are millions of qr codes that are already wasted.

Or unreadable codes, imagine a checkerboard pattern. You can’t read that (even if it had eyes and the 010101010 connecting lines between the eyes. Yes all qr have, by definition, lines of alternating black and white dots between the “eyes” of the code). A checkerboard pattern wouldn’t have a header to tell the size, encoding and error correction used. There a million of patterns that would not result in a complaining qr code.

Yet, there’s still millions of ways to create different URL addresses, presentation cards, mail addresses, WiFi info and all the other stuff a qr can contain like, even a game… https://youtu.be/ExwqNreocpg

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