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.
Articles
How to use PromptPay QR codes, barcodes and tracked QR codes: practical guides and tips for shops and businesses.
#printing · 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.
PromptPay payment sign: a free, print-ready scan-to-pay card
Make a scan-to-pay PromptPay sign for free: shop name, the account name customers should see, A6, A5 or business-card size, on A4 with cut lines.