React Hooks Tutorial: Complete Guide
Master React Hooks for building QR code scanner components, mobile-responsive interfaces, and interactive web applications.
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QR (Quick Response) codes are two-dimensional barcodes that can be scanned using a smartphone camera or a dedicated QR code reader. They were invented in 1994 by Denso Wave, a subsidiary of Toyota, to track automotive parts during manufacturing. Today, QR codes are used for a wide range of applications, from marketing and payments to information sharing and authentication.
QR codes store information in a pattern of black and white squares, called modules. The pattern includes three large squares in the corners that help the scanner identify the QR code's orientation. The rest of the pattern contains the encoded data and error correction codes.
When a QR code is scanned, the reader analyzes the pattern and converts it back into the original data. This data can be text, a URL, contact information, or any other type of information that can be encoded in text format.
QR codes can store various types of information, including:
QR codes come in different versions, from Version 1 (21×21 modules) to Version 40 (177×177 modules). The higher the version, the more data the QR code can store. The maximum capacity depends on the type of data being encoded:
QR codes include error correction data, which allows them to be read even if part of the code is damaged or obscured. There are four levels of error correction:
Higher error correction levels make the QR code more reliable but also increase its size and complexity.
QR codes are used in many different contexts, including:
QR codes can be customized in various ways while maintaining their scannability:
Using our QR code generator is simple:
To ensure your QR codes are effective and scannable:
This QR code generator processes all data entirely in your browser. Your content is never sent to any server, ensuring your data remains private and secure. For additional encoding and security tools, explore our Base64 Encoder and Hash Generator.
Enhance your mobile and web development workflow with our other sharing and utility tools:
Convert QR code images to Base64 for embedding directly in mobile apps and web applications without external files.
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