What is a QR Code?
Discover the technology behind QR codes and how they've revolutionized digital communication.
The Basics
A QR (Quick Response) code is a two-dimensional barcode that can store various types of data:
- đĸNumeric Data
Up to 7,089 characters of numbers
- đ¤Alphanumeric Data
Up to 4,296 characters of letters and numbers
- đžBinary Data
Up to 2,953 bytes of binary data
- đ¯Kanji/Kana
Up to 1,817 characters of Japanese text
How QR Codes Work
QR codes use a sophisticated system of patterns and error correction to ensure reliable scanning:
- đFinder Patterns
Three identical squares in the corners help scanners identify and orient the QR code.
- đAlignment Patterns
Smaller squares that help scanners correct for distortion and perspective.
- đTiming Patterns
Alternating black and white modules that help determine the size of the QR code.
- đĄī¸Error Correction
Redundant data that allows the QR code to be read even if partially damaged.
Common Uses
QR codes have become ubiquitous in modern life, serving various purposes:
- đĸMarketing
Product information, promotional offers, and social media links
- đŗPayments
Mobile payments, digital wallets, and bank transfers
- âšī¸Information
Contact details, Wi-Fi access, and event tickets