What is a QR Code?
A QR (Quick Response) code is a two-dimensional barcode that can store various types of information including URLs, text, contact details, WiFi credentials, and more. QR codes can be scanned using smartphone cameras or dedicated QR code readers, making them an efficient way to share information instantly.
Common QR Code Uses
- Marketing & Advertising: Link to websites, promotions, or product information
- Business Cards: Share contact information instantly
- WiFi Sharing: Allow guests to connect without typing passwords
- Event Tickets: Digital tickets and check-in systems
- Restaurant Menus: Contactless menu access
- Payment Systems: Mobile payment and cryptocurrency transactions
- Product Packaging: Authentication and additional product details
- App Downloads: Direct links to app stores
Error Correction Levels
Low (L) - 7%
Can recover from up to 7% damage. Best for clean, protected environments.
Medium (M) - 15%
Can recover from up to 15% damage. Good balance for most uses.
High (Q) - 25%
Can recover from up to 25% damage. Recommended for outdoor use.
Highest (H) - 30%
Can recover from up to 30% damage. Best for harsh environments.
Best Practices
- Test QR codes on multiple devices before distribution
- Ensure sufficient contrast between QR code and background
- Leave adequate white space (quiet zone) around the QR code
- Use appropriate size - minimum 2cm Γ 2cm for print
- Consider the scanning distance when choosing size
- Keep URLs short to create simpler, more scannable codes
- Use high error correction for outdoor or printed materials
- Include a call-to-action near the QR code
QR Code Security
While QR codes are convenient, be aware of security considerations:
- Always verify the destination URL before scanning unknown QR codes
- Be cautious of QR codes in public places that could be tampered with
- Use QR code scanners that preview URLs before opening them
- Never scan QR codes that promise suspicious offers or prizes
- For sensitive data, consider using encrypted QR codes
Frequently Asked Questions
Do QR codes expire?
Static QR codes (like those generated here) never expire. However, if the content they link to is removed or changed, the QR code will no longer work as intended.
Can I track QR code scans?
Static QR codes cannot track scans. For analytics, you would need to use a URL shortener with tracking or a dynamic QR code service.
What's the maximum data capacity?
QR codes can store up to 4,296 alphanumeric characters, though practical limits are lower for reliable scanning (typically under 1,000 characters).
Can QR codes be customized with colors and logos?
Yes, but maintain sufficient contrast and don't cover more than 30% of the code with logos to ensure scannability.