What is a QR Code
Learn about QR code technology, history, and applications
Written by: GroundCode, AI-assisted, Last reviewed: 2026-03-08
A QR Code (Quick Response Code) is a two-dimensional matrix barcode developed by Denso Wave in Japan in 1994. It can store significantly more information than traditional one-dimensional barcodes and can be easily scanned using smartphone cameras, making it widely used in modern society.
QR Code Structure
A QR code starts with three large square patterns called position detection patterns. These patterns enable quick recognition from any angle. The code includes error correction capability, allowing information recovery even if parts are damaged. Depending on the version, it can store up to 7,089 numeric characters or 4,296 alphanumeric characters.
Types of QR Codes
Static QR codes store information directly in the code itself and cannot be changed once generated. Dynamic QR codes link through a short URL and can be updated later. QRgen.kr generates static QR codes that work permanently without server dependency.
Applications
Today, QR codes are used in payments, marketing, product information, tickets, business cards, menus, and more. Usage surged especially after COVID-19 as contactless services expanded. From restaurant menus to museum guides to product tracking, applications continue to grow.
QR codes have evolved beyond simple technology to become essential in daily life. Anyone from individuals to enterprises can easily utilize them. Create your QR code for free at QRgen.kr.