The Ultimate Guide to QR Code Sizes for Print

QR codes have become an essential tool for bridging the gap between physical and digital worlds. However, one of the most common mistakes people make is printing them too small. If a QR code is too small, a smartphone camera might not be able to resolve the individual dots, rendering the code useless.

The 10:1 Rule

A good rule of thumb for QR code sizing is the 10:1 ratio. This means the scanning distance should be approximately 10 times the size of the QR code.

If you expect someone to scan from 20cm away (like a business card), the QR code should be at least 2cm x 2cm.
If scanning from 1 meter away (like a poster), the QR code should be at least 10cm x 10cm.

Minimum Sizes by Medium

Business Cards

For business cards, where the viewer is holding the card in their hand, the absolute minimum size is 1.5cm x 1.5cm (0.6" x 0.6"). However, 2cm x 2cm is much safer and ensures compatibility with older smartphone cameras.

Flyers and Brochures

Standard A4 or Letter size marketing materials usually warrant a QR code size of at least 2.5cm to 3cm.

Menus and Table Tents

Since customers are sitting at the table, they are usually 30-50cm away. Aim for 3cm x 3cm to ensure a quick and frustration-free scan.

Factors That Affect Scannability

1. Data Complexity

The more information you pack into a QR code (like a very long URL), the more dots it will have. More dots mean the code needs to be larger to remain scannable. Use a URL shortener if your link is excessively long.

2. Contrast

Always use high contrast. Black dots on a white background is the gold standard. If you must use colors, ensure the foreground is dark and the background is very light.

3. Error Correction Level

QR codes have built-in error correction (L, M, Q, H). Higher levels allow the code to be scannable even if partially damaged, but they also increase the density of the dots. For small prints, use Level M (Medium).

Conclusion

Before you commit to a large print run, always perform a test scan with multiple different smartphones. If it doesn't scan instantly, it's likely too small or lacks sufficient contrast.