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How QR codes work, where they fit, and what their scans can tell you.
Why your QR code won't scan: 7 reasons and how to fix them
The code is printed, but phones don't see it. Seven common reasons — from size and contrast to a dead link — and how to check a code before it goes to print.
Static or dynamic QR code: which one to print
A static code carries its content in the image, a dynamic one carries a short link you can repoint later. How to choose before the code goes to print.