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What about a QR code that guests can scan to log into your WiFi without typing an explicit password.

Unless I'm misunderstanding you, this already exists: https://qifi.org/

Format is described on the page if you want to do it manually.

Of course the plaintext password is still encoded in the QR code data, so it's not very secure, but great for home guests.

On my Android Samsung Galaxy, when I want to know the password of a saved Wifi, I generate a share-QR, screenshot it, and have a QR scanner scan the picture to extract the password. It drives me nuts, the password is clearly not secure/protected, still the UI will only give me the QR code, not the plaintext. PLEASE tell me I am just too stupid to find the right menue!

Yeah, it's annoying. On my Samsung phone I have a "save image" option, which I can then view the photo in Google photos which has the Google lens option that will show the password.

On my pixel I get both qr and password.

I prefer https://mywifisign.com/en for the modern-esque background and verbiage.

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