📱 QR Code Generator

QR Code Specifications: Versions: • Version 1: 21x21 modules (up to 25 characters) • Version 2: 25x25 modules (up to 47 characters) • ... • Version 40: 177x177 modules (up to 4,296 characters) Error Correction Levels: • L (Low): ~7% recovery capability • M (Medium): ~15% recovery capability • Q (Quartile): ~25% recovery capability • H (High): ~30% recovery capability Data Capacity (Version 40, Level L): • Numeric: 7,089 characters • Alphanumeric: 4,296 characters • Binary: 2,953 bytes • Kanji: 1,817 characters Module Structure: • Finder patterns: 3 corner squares • Timing patterns: Alternating modules • Alignment patterns: Position reference • Format information: Error correction level • Version information: QR code version • Data and error correction: Actual content Color Requirements: • High contrast between foreground/background • Dark modules on light background (standard) • Light modules on dark background (inverted) • Avoid similar colors (red/green) Size Recommendations: • Minimum: 2cm x 2cm for close scanning • Business cards: 1.5cm x 1.5cm minimum • Posters: Scale based on viewing distance • Digital displays: Minimum 150x150 pixels Quiet Zone: • Minimum 4 modules wide border • Essential for proper scanning • Should be same color as background • Prevents interference from surrounding elements

QR Code Best Practices: Design Guidelines: • Use high contrast colors • Maintain adequate quiet zone • Test scanning from various distances • Avoid complex backgrounds • Keep design simple and clean Size Considerations: • Larger codes scan more reliably • Consider viewing distance • Account for printing resolution • Test on target devices Error Correction: • Use higher levels for damaged environments • Lower levels for clean, digital displays • Balance between reliability and capacity • Consider use case requirements Content Optimization: • Keep URLs short (use URL shorteners) • Use standard formats for compatibility • Test with multiple QR readers • Avoid special characters when possible Placement Tips: • Eye-level positioning when possible • Good lighting conditions • Flat, non-reflective surfaces • Clear instructions for users Testing Checklist: • Multiple QR code readers • Different devices (iOS, Android) • Various lighting conditions • Different distances • Print quality verification Common Mistakes: • Too small size • Poor contrast • Missing quiet zone • Complex custom designs • Untested URLs Accessibility: • Provide alternative access methods • Include descriptive text • Consider users with disabilities • Test with assistive technologies Security Considerations: • Verify destination URLs • Use HTTPS when possible • Avoid sensitive information • Consider URL shortener risks • Educate users about QR safety