QR code error correction levels L, M, Q, H: can you add a logo?
What QR error correction levels L, M, Q and H mean (about 7, 15, 25 and 30%), the trade-off with dot density, why logos need H, and what QRnaka automates.
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How to use PromptPay QR codes, barcodes and tracked QR codes: practical guides and tips for shops and businesses.
#qr-basics · All articles
QR code won't scan? Print size and how to test before printing
Why printed QR codes fail to scan: too small, weak contrast, no quiet zone, too much data, glare. The size rule of thumb and a test with several phones.
Why a QR scan shows ads, and how to check before you print
Ads or an in-between page after a scan usually come from a free dynamic QR plan, a link shortener or the scanner app. How to check before printing.
Do QR codes expire? Static and dynamic QR codes explained
A plain QR code carries its own data and has no expiry date. A dynamic one depends on the service behind it. Know which you have before you print.