What is a QR Code and How Does It Function?
Invented in 1994 by the Japanese automotive company Denso Wave to track auto parts, the QR code (Quick Response code) is a two-dimensional matrix barcode. Unlike standard one-dimensional UPC barcodes that encode data across a single horizontal line of varying widths, QR codes store information in both horizontal and vertical directions across square grid modules.
Reed-Solomon Error Correction Explained
A defining feature of QR codes is built-in Reed-Solomon error correction. This mathematical algorithm allows physical QR codes to be cleanly decoded even if up to 30% of the symbol is obscured, smudged, torn, or covered by a decorative brand logo.
- Level L (Low): Approximately 7% of damaged codewords can be restored.
- Level M (Medium): Approximately 15% error correction (standard for general web links).
- Level Q (Quartile): Approximately 25% error correction.
- Level H (High): Up to 30% error correction (ideal for high-wear outdoor posters and restaurant menus).
Frequently Asked Questions
No. These are static, direct QR codes that contain your exact URL or text string permanently encoded in the pixel matrix. They never expire and do not route through any intermediary redirect server.
Yes. The QR code standard is an open ISO standard (ISO/IEC 18004). You can print them on business packaging, brochures, and commercial flyers completely free.