@revk
Missing (so far) in the replies is how to generate a QR code with the text or URL you want. I didn't know.
I accidentally found out that using duckduckgo to search for "qr code https://www.example.com" generates the qr code.
(Initially I searched for "qr code format" and was surprised, but delighted, to be presented with a QR code that represents the word "format")
The Wikipedia page on QR codes suggests LibreOffice can generate them too