Live site hosted on Azure using their "free for hobby use" plan.
Or on https://pedasmith.github.io/GenerateWiFiQrCode/QRCodeWiFi.html with Github Pages.
This very simple HTML web page generates correct QR codes for Wi-Fi networks.
Unlike some other pages this one generates a "foldable" style QR code page, like you'd see at the front desk of a coffee shop or hotel. The output doesn't include any kind of branding for this generator site, and the site contains no ads or tracking (at least, none that I added -- if the Azure hosting does something, that's something I don't know about).