Everything we've learned building a QR generator — what makes a code scan reliably, what quietly breaks it, and how to get it right before you send anything to a printer.
Make a QR code that connects guests to your Wi-Fi with one scan. How the WIFI: format works, why special characters break most generators, and how to test it properly.
A checklist for QR codes that fail to scan, ordered by how often each cause is the real one. Covers contrast, inverted colours, size, quiet zone and print problems.
Everyone says a logo can cover 30% of a QR code. We measured it, and codes stop scanning far earlier than that. Here are the real numbers and what they mean for your design.
What L, M, Q and H actually do, how much damage each survives, and why the highest setting is usually the wrong choice. With real capacity figures from the ISO standard.
Static QR codes never expire. Dynamic ones stop working if you stop paying. What the difference actually is, and how to get re-editable codes without a subscription.
The 10:1 distance rule, minimum sizes for business cards, posters and billboards, why the quiet zone matters, and how to calculate the exact size you need.
How to find your Google review link, turn it into a QR code that lasts, and stay inside Google's review rules - including the April 2026 changes that banned staff quotas.
When a raster PNG is fine and when you need vector SVG. What actually goes wrong when you scale a PNG, and why printers ask for vector files.
Sizing, placement, lighting and the mistakes that cost restaurants covers. What to link to, why static codes have a catch, and how to test before printing table cards.
How contact QR codes work, why a full vCard often makes a code too dense to scan, and when to link to a contact page instead.