Made a QR code but not sure how big to print it? Too small and it won't scan; too big and it overwhelms the design. This guide covers recommended sizes by use case and how to calculate the optimal size.
Minimum Size Guideline
A reliably scannable QR code should be at least 1.5 cm × 1.5 cm (about 15 mm per side). But this is the minimum under ideal conditions.
Three factors affect the minimum viable size:
- Data volume: More data = finer dots = larger size needed
- Error correction level: Higher levels add more dots, requiring more space
- Print quality: Low-resolution printers need a larger code
Recommended Sizes by Use Case
Business Cards (Scanning Distance: 15–30 cm)
| Parameter | Recommended |
|---|---|
| QR code size | 1.5 cm × 1.5 cm to 2 cm × 2 cm |
| Placement | Back side, lower-right corner |
| Margin | At least 2 mm |
Space is limited on business cards, but a short URL keeps the code compact and scannable.
Flyers (Scanning Distance: 20–50 cm)
| Parameter | Recommended |
|---|---|
| QR code size | 2 cm × 2 cm to 3 cm × 3 cm |
| Placement | Near the call-to-action text |
| Margin | At least 3 mm |
Pair the code with text like "Learn more here" to boost scan rates.
Posters (Scanning Distance: 50 cm – 2 m)
| Parameter | Recommended |
|---|---|
| QR code size | 5 cm × 5 cm to 10 cm × 10 cm |
| Placement | Eye level or below |
| Margin | At least 5 mm |
Posters are viewed from a distance, so generous sizing is essential.
Signage and Banners (Scanning Distance: 2 m+)
| Parameter | Recommended |
|---|---|
| QR code size | 10 cm × 10 cm or larger |
| Placement | Along the foot traffic path, in clear view |
| Margin | At least 1 cm |
For outdoor use, account for weather degradation — use a larger size and error correction level H (30% recovery).
Web and Social Media (On-Screen)
| Parameter | Recommended |
|---|---|
| Display size | 200 px × 200 px or larger |
| Source resolution | At least 300 px × 300 px |
| Format | PNG recommended (avoids JPEG compression noise) |
On-screen QR codes are scanned from a second device, so display size matters.
The Scanning Distance Formula
Calculate the optimal size with this simple formula:
QR code side length ≥ scanning distance ÷ 10
| Scanning Distance | Minimum QR Code Size |
|---|---|
| 15 cm (business card) | 1.5 cm |
| 30 cm (flyer) | 3 cm |
| 1 m (poster) | 10 cm |
| 3 m (signage) | 30 cm |
Don't Forget the Quiet Zone
The white margin around a QR code — the "quiet zone" — is mandatory. Without it, the camera can't find the code's edges.
- Minimum required: 4 modules (4 dots wide)
- Practical guideline: About 10% of the code's width on each side
- Color: Same as the background (usually white)
It's tempting to trim the margin for design, but it directly impacts scan reliability.
Resolution and Image Format
Image quality directly affects scan accuracy.
| Use Case | Recommended Resolution | Recommended Format |
|---|---|---|
| Web display | 72 dpi+ | PNG |
| Print (business cards, flyers) | 300 dpi+ | PNG / SVG |
| Large-format print (posters, signage) | 300 dpi+ | SVG (no quality loss when scaled) |
Pre-Print Checklist
Before printing or distributing your QR code:
- Is the size appropriate for the expected scanning distance?
- Is there sufficient quiet zone (margin) on all sides?
- Was the image exported at 300 dpi or higher for print?
- Has the actual printed piece been scan-tested on multiple smartphones?
- Could a URL shortener reduce the data density?
Summary
Size your QR code using the "scanning distance ÷ 10" formula, then adjust for data density and print quality. Don't overlook the quiet zone and resolution — both have a major impact on scan reliability.
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