Guides to QR codes

How to scan a QR code on your phoneThe built-in camera is almost always enough. iPhone, Android, codes on your own screen and what to do when scanning fails. QR code not scanning: 10 causesWhen a code fails, the print or the design is almost always to blame, not the phone. Work through the list from most to least common. What size QR code do you need for printOne formula and a table for common formats — from a business card to a building banner. A logo in a QR code: without breaking itA logo makes the code recognisable but hides part of the data. Here is where the limit is and how to stay inside it. Static or dynamic QR codeThe key question before a print run: will the code still work in a year if you stop paying a service? Error correction: L, M, Q or HOne setting decides whether a code survives scratches, dirt and a logo. Explained without the maths. Colored QR codes: which colors workA code does not have to be black and white. Follow one contrast rule and avoid a few risky combinations. Where to place a QR code so people scan itA good code in the wrong spot gets zero visits. Three conditions for success and places that are proven to work. QR menu for restaurants: step by stepFrom choosing a menu format to cards on every table — in one evening and without subscriptions. Wi-Fi via QR code: is it safeA QR code is no less secure than a password written on a board by the till. But without a few settings guest Wi-Fi is a risk. QR code on a business card: what to includeA card with a code gets saved to the phone instead of lost in a pocket. Decide what to encode and how to design it. QR code safety: how to avoid scamsA QR code itself is harmless — it is just a link. The danger is where it leads. The common schemes and simple rules to check.