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useful
Decoding small QR codes by hand - It's not hard to decode QR codes with a pen and paper. For this guide I'm going to grab a random QR code from google images and show the process of decoding it by hand. QR codes contain a lot of error correction information and they can survive a lot of errors, but that's a lot harder to do using just a pen and paper (and 99% of the QR codes you encounter don't have any missing bits, so it's rarely necessary). So I'll highlight where the error correction information is stored, but I won't explain it in this guide.
From Nony


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