QR Code Best Practices
Everything you need to know to make your QR codes work perfectly — from the right size to safe usage.
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Choosing the Right Size
Business Cards & Flyers
Minimum size for simple URLs. Scan distance: 10-15 cm.
Posters & Displays
For scan distances up to 50 cm. With a logo, at least 6 cm.
Billboards & Banners
For long distances. Rule of thumb: QR size = scan distance / 10.
Contrast Is Key
Do It Right
- Dark foreground on light background
- At least 4:1 contrast ratio (WCAG)
- Black on white always works
- Dark blue, dark green, dark red on white = good
- qr9 shows you readability in real time
What to Avoid
- Light colors on light background (yellow on white)
- Inverted QR codes (white on black) — some scanners fail
- Too many colors or gradients
- Transparent background on colorful surfaces
- Similar colors for foreground and background
Printing & Placement
Suitable Materials
- Paper, cardboard (matte preferred)
- Stickers & labels
- Textiles (screen printing, embroidery at sufficient size)
- Metal & wood (laser engraving)
- Screens & displays
Placement
- At eye level or slightly below
- Not in corners or on edges
- Sufficient quiet zone (white border) around the QR code
- Not on curved surfaces (bottles only at sufficient size)
- Always include a call to action ("Scan now!")
Using QR Codes Safely
For Creators
- Use dynamic QR codes — URL can be changed anytime if misused
- Enable scan tracking to detect unusual activity
- PIN protection for confidential content
- Use your own domain to build trust with scanners
- qr9 automatically checks URLs for security risks
For Scanners
- Check the URL before opening it (displayed on the smartphone)
- Do not scan QR codes from unknown sources
- Be cautious of QR codes pasted over existing ones
- Never enter passwords or payment details via QR code links
- When in doubt, type the URL manually in the browser
Frequently Asked Questions
What is the minimum size for a QR code?
At least 2x2 cm for simple URLs. With a logo or lots of content, at least 3x3 cm. For posters and distance scanning, proportionally larger.
What color contrast is needed?
At least a 4:1 contrast ratio. Dark foreground on light background works best. qr9 shows you readability in real time while creating.
Can I print a QR code on any material?
Yes, as long as contrast and minimum size are maintained. Matte surfaces work best. Avoid highly reflective or transparent materials.
How do I protect myself from QR code fraud?
Check the URL before opening it. Do not scan QR codes from unknown sources. As a creator: use dynamic QR codes with tracking and PIN protection for confidential content.