Guides
The parts of a QR code that decide whether your design works in the real world. Worth ten minutes before a print run.
Error correction levels, and which one you actually need
The highest setting is not the safest setting. What each level costs, and when the tradeoff is worth it.
How big a logo can you put on a QR code
A logo is deliberate damage to the code. Here is how much damage the code can absorb, and where it must never land.
What size to print a QR code
One simple ratio gives you the right size for any scanning distance. Plus the two mistakes that ruin a print run.
What is really inside a WiFi QR code
The format is simple text, and that has a consequence worth understanding before you put one on a wall.