What Is a QR Code and How Does It Work
A complete guide to QR codes — how they store data, their types, and how to generate them for free.
QR Code Basics
QR (Quick Response) codes are two-dimensional barcodes that store data in a grid of black and white squares. They can encode URLs, text, contact information, WiFi credentials, and more.
How QR Codes Store Data
QR codes use Reed-Solomon error correction to remain readable even when partially damaged. Data is encoded in patterns of modules (squares) arranged in a specific format.
Types of QR Codes
Static QR codes contain fixed data, while dynamic QR codes can be updated after creation. Different versions support varying amounts of data, from a few characters to several kilobytes.
Creating Custom QR Codes
Modern QR generators allow customization of colors, dot styles, corner shapes, and even embedded logos. These styled QR codes are more visually appealing while remaining fully scannable.
Conclusion
QR codes are versatile, reliable, and easy to create. With free online generators, anyone can create customized QR codes for business, marketing, or personal use.