QR Code Size Guide: How Big Should Your QR Code Be?

There's a simple formula for QR code sizing that most designers never use: the minimum QR code size should be 1/10th of the viewing distance. A person reading a business card holds it 25–30 cm away, so the QR code needs to be at least 2.5–3 cm. A billboard viewed from 10 metres needs at least a 1-metre QR code.

Minimum QR Code Sizes by Medium

• Business card (25–30 cm viewing distance): 2.5 × 2.5 cm minimum
• A5/A4 flyer or leaflet (30–50 cm): 3 × 3 cm minimum
• Magazine or newspaper ad (40 cm): 4 × 4 cm minimum
• Poster A2/A1 (1–2 metres): 10–20 × 10–20 cm minimum
• Banner or exhibition stand (2–5 metres): 20–50 × 20–50 cm minimum
• Outdoor advertising, bus shelter (3–10 metres): 30 cm–1 m
• Billboard (10–50 metres): 1 m or larger

Why QR Code Size Matters

Camera phone sensors and QR-reading algorithms need to resolve individual modules (the small squares that make up the QR pattern) clearly. An undersized QR code at distance doesn't give the sensor enough pixel resolution to read the pattern. This is one of the most common — and entirely avoidable — causes of QR scan failure.

Complexity Affects Minimum Size

A denser QR code (more data = more modules = smaller modules) requires a larger minimum size than a simpler one. Dynamic QR codes encode a short URL (typically 15–25 characters), resulting in a much simpler, larger-module pattern than a static code encoding a 200-character URL. This is another reason to prefer dynamic codes for print.

Resolution Requirements for Print

For print, always export QR codes as SVG (vector, infinitely scalable) or at a minimum of 300 DPI at the final print size. A PNG generated at 200 × 200 pixels is fine for an email but will print blurry at 3 × 3 cm. Ask your QR code generator for the highest resolution PNG or, better, an SVG file.

Testing at Final Size

The only reliable way to know if your QR code is the right size is to print a test at full size and scan it from the expected viewing distance. Print a single test page before committing to a full print run. Scan it with both iOS and Android devices under realistic lighting conditions.