Information capacity and versions of QR Code

There are 40 versions of the QR Code. Details of these are explained here.

15 Essential Facts About 2D Barcodes

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CE#5 → QR codes were born at Toyota.

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ICT Hub Ltd - CONTINUATION ON QRCODE That tiny QR code

QR code - Wikiwand

What Size Should A Printed QR Code Be? - QRStuff.com

DENSO WAVE Develops “rMQR Code”, a new rectangular QR Code that can even be printed in long, narrow spaces.

Use f0 to store QR-codes, barcodes, notes, etc - 3rd-party modules

QR code - Wikipedia

Secure QR codes for anti-counterfeiting, with examples