Choosing the right size for a QR code is essential to guarantee a first-time scan.
The basic formula
Divide the expected scanning distance by ten. At 30 cm (business card) the minimum is 3 cm. For a poster read at 2 metres, plan for at least 20 cm.
Recommended sizes by medium
Business card: 2-3 cm. A5 flyer: 3-4 cm. A4 restaurant menu: 4-5 cm. A3/A2 poster: 8 cm minimum. Billboards: 30 cm or more.
Impact of content complexity
The more data, the more modules and the larger it must be. Use a URL shortener to reduce encoded data and keep the code compact.
Resolution and file format
Export in SVG for perfect sharpness at any size. If using PNG, ensure 300 DPI at the final print size.