What is a QR Code

Created on 30 July, 2024 • 2 minutes read

A QR Code (Quick Response Code) is a two-dimensional barcode designed to quickly read information. It was first created in 1994 by the Japanese company Denso Wave, a subsidiary of Toyota, to track auto parts during production.

QR codes are a versatile and powerful tool for quick access and information exchange that continues to evolve, offering new and innovative ways to connect the physical and digital worlds.


History and Development

  • Created by Denso Wave: Designed for the automotive industry to quickly scan and store information about parts.
  • Evolution: QR codes have become widely used in various industries, including marketing, payment systems and logistics.

Structure and Components

  • Marking Modules (Position Markers): Three large squares located in the corners of the QR code. They help the scanner determine the orientation of the code.
  • Alignment Marker: A small square next to the lower right corner, which ensures accurate reading of the code even when it is distorted.
  • Timing Pattern: Alternating black and white modules between the marking modules to help the scanner determine the size of the data grid.
  • Version Information: Located next to the alignment module, indicating the version (size) of the QR code.
  • Format Information: Located next to the marking modules and contains information about the error correction level and mask.
  • Data and Error Correction Keys: The actual information encoded in the QR code, as well as data to restore the code in case of damage.

Types of QR Codes

  • Static QR Codes: Contain immutable information. They are used for URLs, contact details, and texts.
  • Dynamic QR Codes: Allow you to change the data after creating the code. Useful for tracking, analytics and when information may need to be updated.

Usage and Application

  • Marketing and Advertising: Redirecting users to websites, videos, social media or promotional materials.
  • Payments: Used in mobile payment systems such as Apple Pay, Google Wallet and other digital wallets.
  • Product Tracking: In logistics and supply chain management to track products at various stages.
  • Authentication and Verification: For secure login, event ticket sales and product authentication.
  • Information Exchange: Quick exchange of contact information, Wi-Fi passwords or event details.

Security and Privacy

  • Risks: QR codes can be used for malicious purposes, for example, for phishing. Scanning a QR code can redirect a user to a malicious site or download malware.
  • Best Practices: Make sure that QR codes come from reliable sources, use security software when scanning QR codes, and avoid scanning codes from unknown or suspicious sources.

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