QR code guides
Short, honest answers to the questions people actually ask before they print a QR code — why one won't scan, whether WiFi codes are safe, and how static codes differ from the dynamic ones that expire.
Why won't my QR code scan? 12 fixes
The 12 most common reasons a QR code fails to scan — low contrast, inverted colors, no quiet zone, printed too small — and exactly how to fix each.
Are WiFi QR codes safe?
What a WiFi QR code actually encodes, the one real risk (it's convenience, not secrecy), and the guest-network rule that makes them safe to print.
Static vs dynamic QR codes
How static and dynamic QR codes actually differ, why static codes never expire, and the few cases where you genuinely need a (paid) dynamic code.
QR code size & resolution: how big to print
The simple distance ÷ 10 rule for sizing a printed QR code, the minimum module size that survives printing, and why you should export SVG instead of a small PNG.
QR error-correction levels (L/M/Q/H) explained
What the L, M, Q and H error-correction levels really do, when a higher level helps (logos, rough surfaces) and when it just makes your code denser and harder to scan.