What's the minimum printable size?
Printing a QR code too small is one of the most common reasons they fail to scan. Here are the guidelines for different use cases.
Minimum sizes by use case
| Use case | Min size | Scanning distance |
|---|---|---|
| Business card | 2 cm × 2 cm | 5–15 cm |
| Flyer / brochure | 3 cm × 3 cm | 10–30 cm |
| Poster (A3/A2) | 4 cm × 4 cm | 30–60 cm |
| Retail shelf label | 2.5 cm × 2.5 cm | 10–20 cm |
| Outdoor billboard | 20 cm × 20 cm+ | 3–10 m |
| Screen / digital display | 100 px × 100 px min | arm's length |
The 10:1 rule
A reliable rule of thumb: the maximum scanning distance is approximately 10 times the width of the QR code. A 3 cm code will scan reliably from up to 30 cm away. A 10 cm code will scan from up to 1 metre.
Factors that affect minimum size
- Data density — more content encoded = more modules = harder to print small
- Error correction level — higher levels add more modules, requiring larger print
- Logo presence — reduces effective scanning area, may require slightly larger size
- Print quality — offset printing is sharper than inkjet; digital screens are sharp
⚠️ Always print a physical proof and scan it before approving a large print run. Monitor conditions (lighting, angle, surface reflectivity) affect real-world scan reliability.