Why free QR codes stop working, and how to make ones that never expire
Static vs dynamic QR codes: spot a code that depends on someone else's service before you print it, and keep the page behind a static code in place.
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A code fails to scan for one of four reasons: it is too small, the quiet zone is cropped, the contrast is weak, or the print resolution is low. All four are covered in the articles of this section.
The generator draws codes as vectors, so the edges stay sharp at any size. A small code still has a limit, and the same articles show where it is.