What is a QR Code?
Definition: A QR (Quick Response) code is a two-dimensional barcode that stores data in a matrix of black and white squares, readable by smartphone cameras and dedicated scanners.
Invented in 1994 by Denso Wave for tracking automotive parts, QR codes have evolved into a universal data-sharing tool. Unlike traditional barcodes that store data in one dimension, QR codes use a 2D matrix pattern that can encode URLs, text, contact info, WiFi credentials, and more. Modern smartphones can scan QR codes instantly using their built-in camera apps, making them accessible to billions of people worldwide.
Key points
- Stores up to 4,296 alphanumeric characters
- Error correction allows reading even when partially damaged
- Scannable from any angle (360°)
- Supports multiple data types (URL, text, vCard, WiFi)
- Free to create and use — no licensing fees
Frequently asked questions
Who invented QR codes?
QR codes were invented in 1994 by Masahiro Hara at Denso Wave, a subsidiary of Toyota. They were originally designed to track vehicle parts during manufacturing.
Are QR codes free to use?
Yes! Denso Wave holds the patent but chose not to exercise patent rights. QR codes are free to create and use for any purpose.
How much data can a QR code store?
A QR code can store up to 7,089 numeric characters, 4,296 alphanumeric characters, or 2,953 bytes of binary data. Larger data creates denser, harder-to-scan codes.
Related terms
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