QR Code — Quick Reference
Concise overview: what a QR code is, structure, types, uses, advantages, and a quick creation example.
Introduction
A QR Code (Quick Response Code) is a two-dimensional barcode that stores information such as URLs,
text, contact details, or payment data. It was developed in 1994 by Denso Wave to track automotive
parts.
Structure of a QR Code
- Finder Patterns – Large squares at three corners used for orientation.
- Alignment Patterns – Help correct distortion when scanning.
- Timing Patterns – Define the grid structure.
- Data Area – Section that stores the encoded information.
- Error Correction – Allows recovery of data if the code is damaged (levels L, M, Q, H).
Types of QR Codes
- Static QR Code – Content is fixed after generation; ideal for permanent links or text.
- Dynamic QR Code – Uses a redirect (short URL) allowing content to be changed and scans to be
tracked.
Common Uses
- Website links and digital business cards (vCards).
- Online payments (UPI, PayPal, etc.) and donation pages.
- Product packaging for tracking and authentication.
- Event tickets, e-menus, and contactless experiences.
- Wi‑Fi access sharing and app download links.
Advantages
- Fast and easy to scan using most smartphones.
- Can store a large amount of data compared to linear barcodes.
- Supports multiple data types: URLs, text, numeric, binary.
- Error correction improves scan reliability even with partial damage.
