QR Code Sizes Guide
Choosing the right QR code size is crucial for reliable scanning. Too small and cameras can't focus; too large wastes space. This guide helps you choose the optimal size for any application.
The Basic Rule
QR Code Size = Scanning Distance ÷ 10
If someone will scan from 1 meter away, your QR code should be at least 10cm. From 30cm (arm's length), at least 3cm.
Size Recommendations by Use
| Application | Recommended Size | Notes |
|---|---|---|
| Business Cards | 2-3 cm (0.8-1.2") | Minimum viable size, short URLs recommended |
| Product Labels | 2-4 cm (0.8-1.6") | Depends on label size, test with target content |
| Flyers & Brochures | 3-5 cm (1.2-2") | Comfortable scanning distance |
| Posters (indoor) | 8-15 cm (3-6") | For 1-2 meter viewing distance |
| Billboards/Signage | 30+ cm (12"+) | Scale for expected viewing distance |
| Table Tents/Menus | 4-6 cm (1.6-2.4") | Arm's length scanning |
| Digital Screens | 200-300px | Depends on screen size and viewing distance |
| Email Signatures | 80-120px | Keep small, link to simple content |
Factors Affecting Scannability
Data Complexity
More data = denser pattern = harder to scan at small sizes. Keep URLs short or use URL shorteners.
Error Correction
Higher error correction levels create denser patterns but allow for damage tolerance.
Contrast
High contrast (dark on light) improves scanning. Avoid similar-colored foreground and background.
Quiet Zone
Leave white space around the QR code (equal to 4 modules minimum) for reliable detection.
Print Resolution Guidelines
When printing QR codes, resolution matters. Here's what you need:
- Minimum: 150 DPI (dots per inch)
- Recommended: 300 DPI for professional printing
- Best practice: Use SVG format which scales to any size without quality loss
Pro Tip: Always download QR codes as SVG for print materials. You can scale them to any size without pixelation.
Testing Your QR Code
- 1. Test at actual size: Print a test before your final run
- 2. Use multiple devices: Test with different phones and camera apps
- 3. Test at expected distance: Scan from where your audience will
- 4. Check lighting conditions: Test in the actual environment
- 5. Verify the destination: Make sure the link/content is correct