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QR code guides
How QR codes work, what makes them stop working, and how to print them so they scan.
How to change a QR code after it's printed
You can't edit the pattern on paper, but you can often change where it leads. Three situations, and what to do in each.
Do QR codes expire?
A QR code has no expiry date built in, but the link inside it can stop working. How to tell a static code from a dynamic one, and what makes each fail.
How big should a QR code be?
Make it a tenth of the scanning distance, and never under 2 cm. A size table for cards, menus, posters and signs, and what matters as much as size.
What happens to your QR codes if the QR company shuts down
Static codes keep working. Dynamic codes follow their short domain, and what happens to that domain decides everything. How to protect printed codes.
How to put a logo in a QR code without breaking it
A logo covers part of the code, and error correction makes up for it. How big the logo can be, where it goes, and how to check the result.
Why put your QR codes on your own domain
A dynamic code printed as qr.yourbrand.com belongs to you, not to the QR service. What that changes, and how the one-record setup works.
Wi-Fi QR codes: how they work, and what happens when you change the password
A Wi-Fi QR code holds your network name and password. Which phones read it, why it stops working after a password change, and where it's safe to use.