QR Code Size Guide
Definition: QR code size refers to the physical dimensions of the printed code, which determines the maximum scanning distance and reliability.
The general rule is that the scanning distance is approximately 10 times the QR code width. A 1-inch code scans from about 10 inches away. For business cards, 0.8 inches minimum. For posters, 2-4 inches. For billboards, the code should be at least 1/10th of the expected viewing distance. Always include a quiet zone (white border) of at least 4 modules around the code.
Key points
- Minimum: 2cm x 2cm (0.8 x 0.8 inches) for close-range
- Business cards: 1x1 inch recommended
- Posters: 2-4 inches for arm's length scanning
- Scanning distance ≈ 10x code width
- Always include a quiet zone (white border)
Frequently asked questions
What is the minimum QR code size?
The absolute minimum is about 2cm x 2cm (0.8 x 0.8 inches) for close-range scanning. For reliable scanning at normal distances, 1x1 inch or larger is recommended.
How big should a QR code be on a poster?
For a poster viewed from 3-5 feet away, make the QR code at least 3-4 inches square. The rule of thumb: scanning distance = 10x the code width.
Does more data make a QR code harder to scan?
Yes — more data creates a denser code with smaller modules. Dense codes need to be printed larger for reliable scanning.
Related terms
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