QR Code Scanning Distance Guide
Definition: QR code scanning distance is the maximum range from which a QR code can be reliably scanned, determined by its physical size, data density, and environmental conditions.
The general rule is a 10:1 distance-to-size ratio — a QR code should be 1/10th of the intended scanning distance. A code scanned from 1 meter away needs to be at least 10cm. For 5 meters, at least 50cm. This ratio increases for high-density codes (more data = smaller modules = closer scanning needed). Environmental factors like lighting, screen glare, and code damage also affect maximum scanning distance.
Key points
- 10:1 distance-to-size ratio as baseline
- More data = shorter scanning distance
- Business cards: 2cm minimum at 15cm
- Posters: 10cm+ for 1m distance
- Billboards: 50cm+ for 5m distance
- Good lighting improves scan distance
Frequently asked questions
How big should a QR code be for a poster?
For a poster viewed from 1-2 meters, make the QR code at least 10-20cm (4-8 inches). Test from the expected distance before printing.
What is the minimum QR code size?
The absolute minimum is about 1cm × 1cm for close-range scanning (10-15cm). For practical use, 2cm × 2cm is the recommended minimum.
Why won't my QR code scan from far away?
The code is too small for the distance, has too much data (high density), poor contrast, or insufficient lighting. Increase size or reduce data content.
Related terms
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