QR code - Wikipedia
https://en.wikipedia.org/wiki/QR_code
A QR code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan.
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QR Code is a two-dimensional version of the barcode, typically made up of black and white pixel "QR" stands for "Quick Response", which refers to the instant access to the information hidden in the...
QR Code Generator
https://www.the-qrcode-generator.com/
QR Code readers require a white margin to detect QR Codes. So make sure to print it on a light background The QR Code is only displayed at a size of 200px but it will be saved at a size of 200px.
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QR Code Generator PRO: Create, design, manage, and track QR Codes for great mobile QRCode Monkey is one of the most popular free online qr code generators with millions of already created QR...
QR Code Generator - create QR codes for free (Logo, T-Shirt, vCard...)
http://goqr.me/
QR codes on business cards, T-Shirts, mugs and more! QR codes are the way to go to create a link between the real world products (tagged with the QR code) and the Internet.
QRcode.comÔĹúDENSO WAVE | Types of QR Code
https://www.qrcode.com/en/
QR Code, iQR Code SQRC and FrameQR are registered trademarks of DENSO WAVE INCORPORATED in Japan and in other countries.