Good to know
What size should I print a QR code?
At least 2 cm by 2 cm for a counter or menu. For a poster that people scan from a metre away, go 10 cm or more. Keep a white margin around it.
Can I change the colour?
Yes, but keep the code dark on a light background. Light codes on dark backgrounds often fail to scan.
Does the QR code expire?
No. A QR code is just the text or link drawn as squares. It works as long as the link works.
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