What can I encode in a QR code?
QR codes can store URLs, plain text, contact information (vCard), WiFi credentials, email addresses, phone numbers, SMS messages, calendar events, and geographic locations. The limit is typically 2,953 bytes of data.
Do QR codes expire or stop working?
No, static QR codes (like those generated here) never expire. They contain the data directly and will work forever. However, if your QR code links to a URL and that website goes down, the code won't be useful.
What size should I print QR codes?
For optimal scanning, QR codes should be at least 2x2 cm (0.8x0.8 inches) for close-range scanning. For posters or billboards viewed from distance, scale up proportionally - a general rule is 10% of the viewing distance.
Can I customize QR code colors?
While our generator creates standard black and white QR codes for maximum compatibility, you can edit downloaded images to change colors. Maintain high contrast between foreground and background for reliable scanning.
How do people scan QR codes?
Most modern smartphones have built-in QR code scanners in their camera apps. Users simply open the camera, point it at the QR code, and tap the notification that appears. Dedicated QR scanner apps are also available.