How to make a WiFi QR code sign for your rental

A WiFi QR code lets guests join your network by pointing their phone's camera at a sign, with no squinting at a password. Here's how the codes work, how to make one that scans every time, and the one catch hosts miss.

How a WiFi QR code works

A WiFi QR code is just text in a standard format that phone cameras recognize. When a guest scans it, the phone reads the network name and password from the code and offers to join. Nothing is looked up online, and the code works even before the guest is connected to anything.

The text inside the code looks like this:

WIFI:T:WPA;S:JuniperCottage;P:hikemore2026;;

• T: is the security type: WPA for almost every home router (it also covers WPA2), WEP for very old ones, or nopass for an open network.
• S: is the network name (SSID), exactly as it appears in the WiFi list, including capital letters.
• P: is the password.
• The double semicolon at the end closes the code.

Current iPhones and Android phones read these codes straight from the built-in camera app. On some older Android phones, guests may need Google Lens or the QR option in their WiFi settings.

Getting it to scan every time

• Copy the network name exactly. Most failed scans come from a mismatched name, such as "Juniper Cottage" with a space when the real network is "JuniperCottage". Check it against the WiFi list on your own phone.
• Watch for special characters. If your network name or password contains ; , : \ or ", they must be escaped with a backslash inside the code. A good generator does this for you. If you're building the code by hand, choosing a password without those characters is easier.
• Print it big enough. Make the code at least 2 inches (5 cm) square for a counter sign, and bigger if it goes on a wall guests will scan from across the room.
• Use high contrast. Print dark modules on a light background. Light-on-dark or low-contrast "designer" codes fail on some cameras.
• Avoid glare. Put framed signs where overhead lights won't wash out the glass, or print on matte paper.
• Test with two phones, an iPhone and an Android, before the first guest arrives.

Always print the password too

Some guests will have a laptop, a tablet without a rear camera, or a streaming stick. Put the network name and password in plain text under the code, in a font where 0 and O or l and 1 can't be confused.

The catch: the password lives inside the code

Because the password is stored in the QR code itself, changing your WiFi password breaks every WiFi sign you've printed. If you rotate your password between stays, which is a good habit for security, plan to reprint the WiFi sign each time.

A useful pairing is a second QR code that opens your digital guest guide instead. That code points to a web link, not a password, so it keeps working when your details change. Guests who scan it can see the current WiFi details, check-in steps and house info. You just edit the guide.

What to put on the sign

• A heading guests can spot from across the room, like "📶 WiFi: scan to connect"
• The QR code
• The network name and password in plain text
• One line on what to do if it drops out, like "Router is in the hall closet. Unplug for 10 seconds."