WiFi QR Code: Guests Connect Without Spelling Your Password

Someone asks for the WiFi. You say the network name, they mishear it, you spell it out. Then comes the password, which has a capital in the middle and a symbol at the end, and you say it twice before it takes.

A WiFi QR code replaces that whole exchange with a card on the counter. The guest points a camera at it, taps a prompt, and is on the network.

What a WiFi QR code actually holds

The code carries three things: the network name, the security type, and the password. A phone reads them and offers to join that network, which is why no app is needed at either end.

It is a shortcut for typing, not a different way of logging in. Nothing about the network changes, no account is involved, and the phone connects exactly as it would if the guest had typed everything by hand.

Which phones can read one

On an iPhone, the camera app has read WiFi codes for years. Open the camera, point it at the code, and a banner appears offering to join the network.

On Android, recent versions read them from the camera app or from the Google Lens button inside it. Older phones may need Lens opened directly or a scanner app, which is the main reason to keep the network name and password printed next to the code in readable text.

The phone still has to be in range of the network. A code photographed and sent to someone across town does nothing for them until they arrive.

Your phone might already make one

Before making a code at all, check whether the device already connected to the network can hand one over.

On Android

Open Settings, then Network and internet, then the network you are connected to, and choose Share. Android generates a QR code for that network on the spot and shows the password underneath it. On Samsung phones the same option sits behind the QR icon on the network's detail screen. This is the fastest route when you only need to get one person online.

On an iPhone

There is no built-in generator. iOS can share a password directly with another nearby Apple device by holding the two together, and from iOS 16 you can read a saved password under Settings, then Wi-Fi, then the information icon beside the network. That gives you the password to put into a code, which is usually what you came for.

Where the built-in routes stop being useful is printing. They produce something on a screen, for one person, right now. A card on a wall needs a file you can place in a design and print at the size the room requires.

Making one in about a minute

Open the WiFi QR code generator, fill in three fields, and download the PNG. There is no account needed for this, and nothing to install.

• Network name. Type it exactly as it appears in the WiFi list, including capitals and spaces. This is the field that goes wrong most often, and it fails quietly: the phone offers to join a network that does not exist, then reports it cannot find it.
• Security. WPA/WPA2 covers almost every network in use. WEP is there for genuinely old equipment, and No password is for an open network.
• Password. Paste it as it is. Semicolons, colons, commas, and backslashes have a special meaning inside a WiFi code, and ours escapes them for you, so a password full of punctuation still works.

Then test it before you print, from a phone that is not already on the network. A phone that is already connected will join instantly whatever the code says, which makes a broken code look perfect.

Where to put it

The code has to be reachable by a phone held in one hand, in the light the room actually has.

• A table tent or small card on a counter, reception desk, or café table.
• Inside the welcome folder of a holiday rental, and on the fridge, where people look second.
• On the meeting room wall near the screen, where visitors sit down and immediately need to get online.
• On the back of a printed menu, which costs nothing extra at the print run.

Size it for the distance. The rule of thumb is that the code needs to be about a tenth of the distance it is read from, so a card held at arm's length can be 3 cm across while a sign read from across a room needs to be far bigger. Avoid gloss under a spotlight, which turns the code into a white rectangle from exactly the angle people stand at.

Print the network name and the password in readable text beside the code as well. Laptops cannot scan, some older phones will not, and a guest who has the text can get on while you are still explaining.

What happens when the password changes

Every printed code stops working that day.

The password lives inside the pattern. There is no server in the middle to update, so there is nothing to change. This is true of every WiFi QR code and not just ours: the format was defined to put the credentials in the code, which is also what lets a phone join without an internet connection in the first place.

A QR code can be made editable after printing when it points at a web page, because the page is the part that changes. That cannot join a phone to a network, though. The most it can do is display the current password for someone to type, which is the problem you started with.

So the practical answers are about the network rather than the code:

• Use a guest network with a password you intend to keep. Separating guests from your main network is worth doing anyway, and it means the password on the wall is not one you need to rotate for other reasons.
• Rotate on a schedule you choose, and reprint on the same day. Keep the artwork file, so reprinting is a two-minute job rather than a project.
• Keep the printed version cheap where the password really does change often. A card you can replace beats a laser-cut sign you cannot.

The security part, honestly

A WiFi QR code is a printed password. It is not encrypted, and it hides nothing.

• Anyone who photographs the code has the password and can keep it after they leave.
• Scanner apps show the password as plain text after reading the code, and people do exactly that.
• A code in a street-facing window is available to everyone who walks past, including at three in the morning.

None of that makes WiFi codes a bad idea. It makes them the same idea as writing the password on a chalkboard, with less typing. Treat the code the way you would treat the password written out in full, because that is what it is.

The one change worth making is the guest network. Most routers have one, and it hands out internet without giving a connected device a route to printers, file shares, cameras, or the other machines on your main network. If you are putting a password on a wall, put a guest password on the wall.

For an open network with no password at all, a code still saves the guest from finding the right name in a list of twenty. Guests should know that an open network is unencrypted, whether they arrived by scanning or by typing.

Limits worth knowing before you print

• Hidden networks. Our WiFi codes do not carry the hidden-network flag, so if your network does not broadcast its name, a phone may not find it from the code. Unhide the network, or have guests add it by hand once.
• Networks that ask for a username. Company and university networks that want a username as well as a password use a different login method. This format covers WPA/WPA2, WEP, and open networks, and it cannot carry that.
• Older phones. A few will read the code and show its text rather than offering to join. The printed network name and password beside the code cover this.

Everything else is the same as any other QR code: the margin around the pattern and the error correction come built into the file, and the code downloads at up to 1024 pixels from the QR code generator, which is enough for a counter card or a wall sign.