QR Visualizer

Cervus

About this app

QR Visualizer is a QR code scanner and learning tool that shows how QR codes are decoded step by step.

Scan a QR code with your camera or load an image, then follow the full decoding process visually: image processing, finder patterns, alignment, perspective correction, grid sampling, format information, mask removal, data extraction, error correction, and the final decoded message.

Whether you are learning how QR codes work, debugging a difficult scan, teaching barcode concepts, or just curious about what happens inside a QR reader, QR Visualizer turns the process into a clear visual walkthrough.

Features:

Scan QR codes with the camera or from an image
See each decoding stage visually
Understand finder patterns, alignment, format bits, masks, and data extraction
Explore examples with clean, damaged, large, small, and invalid QR codes
Useful for students, developers, teachers, and curious users
QR Visualizer makes QR code scanning transparent, educational, and easy to understand