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A WiFi QR code lets someone join your network by pointing their camera at it, with no password typing and no spelling out a long passphrase. It is the single most useful QR code for a home, cafe, or office.
The code encodes a short text string containing your network name, password and security type in a standard format that iOS and Android both recognise. When a phone camera reads it, the operating system offers to join that network directly. Nothing is looked up online and no service sits in the middle - the credentials are in the code itself.
Because the password is encoded in the image, anyone who can see or photograph the code can join your network. That is fine for a printed card on a cafe table or a guest network at home, but it is not a way to keep a password secret. If your router supports a separate guest network, put the QR code on that rather than your main one.
Use a high error correction level if you plan to print it small or place a logo in the middle, keep strong contrast between the code and its background, and leave a clear margin around the edges. Do not print smaller than about 2 x 2 cm, and always test-scan with a couple of different phones before sending it to print.
Yes. Both read the standard WiFi QR format with the built-in camera app on current versions.
No. The network details are encoded directly in the image, so it keeps working until you change your WiFi password or network name.
No. The code is generated entirely in your browser, so the password never leaves your device.