QR Code Reader

A QR code (Quick Response code) is a two-dimensional barcode that encodes data as a pattern of black and white squares. It was invented by Denso Wave in 1994 for tracking automotive parts and has since become universal. QR codes can encode URLs, plain text, phone numbers, SMS messages, email addresses, vCard contact information, Wi-Fi network credentials (SSID and password), and payment data. They are scanned by smartphone cameras and dedicated scanner apps using computer vision algorithms that detect the three corner "finder patterns" and decode the data matrix. Reading QR codes from image files is useful for decoding QR codes received in screenshots, documents, or email images without access to a physical scanner.