QR Code Size Guide — Minimum Sizes for Print, Billboard, and Business Card
Find the right QR code size for every use case. Minimum dimensions for business cards, posters, packaging, and billboards.
A QR code that's too small won't scan. One that's too large wastes valuable space on your materials. This guide gives you the exact minimum sizes for every common scenario, plus the math behind it.
The 10:1 Rule
The widely accepted rule of thumb: maximum scan distance is roughly 10 times the QR code's width. A 3 cm QR code can be scanned from about 30 cm away. A 30 cm code works from 3 meters.
This assumes good lighting, a clean code, and a modern smartphone camera. Older phones or damaged codes reduce the effective distance.
Size Reference Table
| Application | Minimum Size | Typical Scan Distance | Resolution (min) |
|---|---|---|---|
| Business card | 2 cm (0.8 in) | 10-20 cm | 300 DPI |
| Product label | 1.5 cm (0.6 in) | 5-15 cm | 300 DPI |
| Flyer / brochure | 2.5 cm (1 in) | 15-30 cm | 300 DPI |
| A4 poster | 4 cm (1.6 in) | 30-50 cm | 300 DPI |
| A3 poster | 5 cm (2 in) | 50-80 cm | 150 DPI |
| Roll-up banner | 8 cm (3 in) | 60-120 cm | 150 DPI |
| Billboard (small) | 20 cm (8 in) | 1-3 meters | 72 DPI |
| Billboard (large) | 50+ cm (20+ in) | 3-10 meters | 72 DPI |
| TV/screen display | 15% of screen height | Viewing distance | Screen resolution |
Factors That Affect Minimum Size
Data density: More data = more modules = each module is smaller at the same overall size. A URL QR code has fewer modules than a vCard with full contact details. Use dynamic QR codes for print — the short redirect URL keeps module count low. Error correction level: Higher error correction (H) adds more modules, making each one smaller. If size is constrained, use level M instead of H. Quiet zone: The white border around the QR code (typically 4 modules wide) is part of the minimum size. Don't crop it. Print quality: Low-resolution printing (newspaper, receipt paper) causes ink bleed that can merge adjacent modules. Increase the size by 20-30% for low-quality print media.Exporting at the Right Resolution
When downloading from QRMax, choose the right format:
| Format | Best For |
|---|---|
| SVG | Print at any size — vector scales infinitely |
| PNG (high-res) | Digital use, web, presentations |
| Print-ready documents, professional printing |
What happens if my QR code is too small?
The phone camera can't resolve individual modules, so the scanner either fails entirely or produces errors. There's no graceful degradation — it either works or it doesn't.
Can I use a QR code on a billboard?
Yes, but with caveats. The code needs to be large enough for the scanning distance, and the viewer needs time to pull out their phone and scan. Billboards at traffic lights work; highway billboards at 120 km/h don't.
Does the phone camera quality matter?
Modern smartphones (2020+) handle QR codes well even in suboptimal conditions. Older or budget phones may struggle with small codes in low light. Design for the lowest-common-denominator device your audience might use.
Related Articles
- How to Print QR Codes — material, resolution, and contrast tips
- QR Code Design Best Practices — colors, logos, and styling
- QR Code on Packaging — sizing for product labels