QR Code Size Guide: How Big Should Your QR Code Be?
QR code size directly affects whether people can scan it. Too small and phones cannot resolve the modules. Too large and you waste valuable print space. This guide provides exact size recommendations for every common use case and the formula to calculate any custom scenario.
Step-by-Step Guide
Learn the Scanning Distance Formula
The minimum QR code width should be at least 1/10th of the expected scanning distance. At 30 cm (1 ft), print at 3 cm minimum. At 1 m (3 ft), print at 10 cm. At 3 m (10 ft), print at 30 cm.
Identify Your Use Case
Business card: 2-2.5 cm (held at arm's length). Table tent: 3-5 cm (30-50 cm distance). Flyer: 3-5 cm. Poster: 8-15 cm (1-2 m distance). Banner: 15-30 cm (2-5 m). Billboard: 50+ cm (5+ m).
Factor in Data Density
QR codes with more data (longer URLs, vCards with many fields) have more modules, making each module smaller. Increase the printed size by 20-30% for high-density codes.
Account for Environmental Conditions
Increase size for: outdoor use (dirty or damaged codes), moving vehicles (people scanning from buses or cars), low lighting, and curved surfaces. Add 20-50% to the minimum size.
Test at the Actual Distance
Print a test at your target size, place it at the expected scanning distance, and scan with 3+ phones. If any fail, increase the size.
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Pro Tips
- When in doubt, go bigger. A QR code that is slightly too large is always better than one that is too small.
- Short URLs create simpler QR codes with fewer modules, which scan better at small sizes.
- The quiet zone (white border) is part of the required size — do not crop into it to save space.
- For packaging on curved surfaces (bottles, cans), increase size by 30% because the curvature distorts the code.
Frequently Asked Questions
What is the smallest a QR code can be?+
The absolute minimum for close-range scanning is about 1.5-2 cm (0.6-0.8 in) for a simple URL. More complex codes need to be larger. In practice, 2.5 cm (1 in) is a safer minimum for reliable scanning.
How big should a QR code be on a billboard?+
For a billboard viewed from 5-10 meters, the QR code should be at least 50-100 cm (20-40 in). However, consider whether people can realistically scan a billboard — they work best in traffic jams or pedestrian areas, not highways.
Does the number of characters in the URL affect the minimum size?+
Yes. Longer URLs create denser QR codes with more modules. Each module must be at least 0.33 mm for scanning. A URL with 20 characters needs a smaller QR code than one with 200 characters.
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