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Plain answers about QR codes.
Do QR codes expire? The honest answer
Static QR codes never expire. Dynamic QR codes can, depending on who made them. Here is how to tell which kind you have and how to avoid a printed code that stops working.
Dynamic vs static QR codes: which one do you need?
Static codes hold the content directly and never stop working. Dynamic codes can be edited and tracked. A plain comparison and a quick way to choose.
QR code stopped working? How to find the cause and fix it
A step by step checklist for a QR code that will not scan or opens the wrong page: print problems, broken links, and dynamic codes switched off by their provider.