Dynamic vs static QR codes: which do you need?
What static and dynamic (editable) QR codes are, how each works, their pros and cons, and a simple way to decide which one to print.
How big should a QR code be when printed?
A practical guide to QR code print size, with the distance rule of thumb, minimum sizes for cards, menus and posters, the quiet zone, and how many pixels you need.
Why QR codes stop working (and how to avoid it)
The real reasons printed QR codes stop working, from broken links and expired subscriptions to tiny prints and glossy paper, with a simple checklist to prevent each one.