QR code guides
Everything we have learned about making QR codes that survive contact with a printer, a phone camera and the real world.
- 5 min read
QR error correction levels explained: L, M, Q and H
Error correction is why a scratched QR code still works — and why a higher level is not automatically better.
- 6 min read
Wi-Fi QR codes for cafés, offices and short-term rentals
Guests connect by pointing a camera at a card. Here is how the format works and how to deploy it without weakening your network.
- 8 min read
How to print QR codes that actually work
Screen previews lie. Here are the numbers that decide whether a printed QR code works: size, distance, margin and ink.
- 6 min read
Static vs dynamic QR codes: what free generators do not tell you
Dynamic codes are editable and trackable. They are also a subscription you can never cancel. Here is how to decide.
- 7 min read
Why your QR code is not scanning, and how to fix it
Nearly every unscannable QR code fails for one of six reasons. Here is how to diagnose yours in under a minute.