QR Code Generator
Generate QR code patterns and learn about QR code structure. Note: For scannable QR codes, use dedicated QR libraries.
Note: This is a visual representation. For scannable QR codes, use a dedicated library.
Input Data
Characters
21
Bytes (UTF-8)
21
About QR Codes
QR codes (Quick Response codes) are two-dimensional barcodes that can store various types of data including URLs, text, contact information, and more.
QR Code Structure
Every QR code contains:
- Finder patterns: Three large squares at corners for orientation
- Alignment patterns: Smaller squares to correct distortion
- Timing patterns: Alternating modules for coordinate reference
- Format information: Error correction level and mask pattern
- Data area: The encoded message with error correction
QR Codes in Geocaching
QR codes are used in geocaching for:
- Puzzle elements: Hidden coordinates or clues
- Multi-cache stages: QR codes revealing next waypoints
- Virtual elements: Links to online puzzle components
- Trackable logging: Quick access to tracking codes
Error Correction
QR codes use Reed-Solomon error correction, allowing them to be read even when partially damaged. Higher error correction means more redundancy but less data capacity.
Data Capacity
Maximum capacity depends on version and error correction level. A Version 40 QR code with low error correction can store up to 7,089 numeric characters or 4,296 alphanumeric characters.