QR Codes in the Modern Age:
From Automotive Parts to Digital Payments
Invented in 1994 by Denso Wave to track automotive parts, QR (Quick Response) codes have evolved into one of the most versatile technologies of the digital age. From restaurant menus to cryptocurrency wallets, these two-dimensional barcodes now connect the physical and digital worlds in ways their creators never imagined.
Unlike traditional barcodes that store data horizontally, QR codes encode information in both directions—allowing them to hold up to 4,296 alphanumeric characters. This capacity, combined with built-in error correction, makes them readable even when partially obscured or damaged.
“With Level H error correction, a QR code can lose up to 30% of its modules and still be readable—enabling creative designs that incorporate logos and patterns.”— ISO/IEC 18004 Standard
Understanding Error Correction
QR codes use Reed-Solomon error correction, dividing data into codewords with redundancy. Level L recovers 7% damage, M handles 15%, Q manages 25%, and H survives 30% loss. Higher levels create larger codes but enable logo overlays and artistic modifications.
Size Considerations
The minimum practical QR code size is about 2cm × 2cm for close-range scanning. For billboards or signage, the rule of thumb is: scanning distance ÷ 10 = minimum code size. A code meant to be scanned from 10 meters should be at least 1 meter wide.
🔒 Security Considerations
QR codes themselves aren't inherently secure—they simply encode data. For sensitive applications, consider URL shorteners with analytics, authentication tokens with expiration, or encrypted payloads. Always preview the destination before scanning unknown codes.
This generator runs entirely in your browser—no data is sent to any server. Whether you're creating marketing materials, contactless menus, or event check-in codes, customize size, colors, and error correction to match your brand while maintaining scannability.