How to Make a Wi-Fi QR Code (and Where to Put It)
A Wi-Fi QR code lets guests join your network without anyone reading a password out loud. Here is how the format works and where it pays off.
Reading a 20-character Wi-Fi password aloud is one of those small rituals nobody enjoys. A Wi-Fi QR code removes it entirely: the guest points a camera at a card and the phone offers to join.
How it works
There is a standard format for this, and it is refreshingly simple. The code encodes a string like:
WIFI:T:WPA;S:MyNetworkName;P:MyPassword;;T is the security type, S the network name (SSID), and P the password. iOS and Android both recognise it natively: no app required on either side. Our generator builds this string for you; you just fill in three fields.
Getting the details right
- Security type. Almost every modern router is WPA/WPA2/WPA3; all use the
WPAvalue. Choose WEP only for genuinely old equipment, and treat that as a reason to replace it. For an open network, select "None" and leave the password blank. - The SSID must match exactly, including capitalisation and spaces. "Cafe WiFi" and "cafe wifi" are different networks as far as the phone is concerned.
- Hidden networks need the hidden flag set, otherwise the phone will not find the network to join even with correct credentials.
- Special characters. Semicolons, commas, colons, and backslashes in a password have to be escaped in the format. The generator handles this, but if you are hand-building a string and it silently fails, this is why.
Where it actually pays off
Holiday rentals and guest rooms, where the alternative is a laminated card people squint at. Cafés and waiting rooms, where staff otherwise repeat the password fifty times a day. Home guest rooms and kitchen noticeboards. Small offices with a visitor network. In every case the win is the same: the network stays properly secured, and nobody has to transcribe anything.
Security worth thinking about
A Wi-Fi QR code is exactly as secret as the password inside it. Anyone who can see or photograph the code can join, and can also decode the password itself: the format is plain text, not encrypted.
So: put it on the guest network, not the network your NAS and printer live on. Most consumer routers can run a guest SSID with client isolation in about two minutes, and it is worth doing whether or not you use a QR code. Keep the card inside the property rather than in a street-facing window. And if you rotate the password, remember the printed card is now wrong; reprinting is the cost of that convenience.
Anyone who can photograph the code can also decode the password: it is stored in plain text. Put the code on a guest network with client isolation, and keep it inside the property rather than in a street-facing window.
Ready to make one? Open the generator, choose the Wi-Fi type, and enter your network details. The code renders in your browser and the credentials are never sent to us.
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