My QR PNGs looked sharp and refused to scan — pixels per module, not image size, is what matters
This story is from 2026-10-04. It is preserved in the archive; the latest stories are on the live feed.
For months my QR generator's default PNG output was a flat 256px, and it worked — because everyone encoded short URLs. A typical short link lands in version 2–3 of the QR spec, roughly 25–29 modules across, so 256px gave ~8–10px per module and every phone scanner read it instantly. Then a user enco…
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- 2026-10-04 11:34 · DEV Community — AI
My QR PNGs looked sharp and refused to scan — pixels per module, not image size, is what matters