How to make a Wi-Fi QR code so guests can join your network without typing the password

Reading a sixteen-character password out loud, letter by letter, is the least welcoming way to get someone online. Guests mistype it, ask again, and the router label ends up being photographed anyway. A Wi-Fi QR code solves this in one step: the phone's camera reads the code, offers to join the network and fills in the password itself.

This guide explains what goes into such a code, how to create one, how to print it so it scans on the first try and what to keep in mind for security. It works the same way for a living room, a holiday rental, a café or an office guest network.

What is inside a Wi-Fi QR code

A Wi-Fi QR code is nothing more than a short line of text in a pattern that phone cameras recognise. The line carries the network name (SSID), the security type (usually WPA/WPA2, sometimes an open network) and the password. A flag can also mark the network as hidden so the phone knows to look for it even though it is not broadcast.

Because the password is stored as plain text, anyone who scans the code can read it with a scanner app. That is not a flaw, it is how the code works, but it means a printed Wi-Fi code deserves the same care as a password written on paper: hang it where your guests are, not where the whole street can see it.

Before you start, check three things

• The exact network name. Capital letters, spaces and special characters all count. Copy it from a phone that is already connected rather than typing it from memory.
• The security type. Most home routers use WPA2 or WPA3; both are entered as WPA in the code. If your router offers a guest network, use that one: guests get internet access without seeing the devices on your main network.
• The password you want to share. If you plan to change it later, remember that the credentials live inside the code itself, so a new password means a new printout.

Create the code in QR Studio

1. Open QR Studio and choose the Wi-Fi code type. Enter the network name exactly as the router broadcasts it, pick the security type and type the password.
2. Scan the preview with a second phone before you print anything. The built-in camera on most recent iPhones and Android phones recognises Wi-Fi codes and shows a join prompt; if yours does not, a scanner app will read the code and show the details.
3. Export the finished code as PNG for a screen or a quick home print, as SVG if a print shop or designer will scale it, or as PDF when you want to print it directly from your phone or tablet.
4. Save the code to a collection with a title such as "Guest Wi-Fi, kitchen" so you can find and export it again when the paper fades or the password changes.

Print it so it scans the first time

• Leave a quiet zone. Keep a clear light margin around the code, at least the width of four of its small squares. Frames and text that touch the pattern are the most common reason a code refuses to scan.
• Make it big enough. A rule of thumb is scanning distance divided by ten: a code read from an arm's length away should be about 3 cm wide; a sign across a lobby needs far more.
• Keep the contrast. Dark pattern on a light background, no inverted colours and no photo behind it. Matte paper avoids glare under spotlights.
• Put it at eye level near where people actually sit or wait, and add the network name in plain text next to it for anyone who prefers to type.

Keep it safe

Treat the printed code as the password it contains. Do not post a photo of it online, use a guest network where possible, and when you change the password simply create a new code and replace the old sheet. Unlike a link, which can be redirected after printing with a dynamic QR code, Wi-Fi credentials are stored in the pattern itself, so the only way to update them is to print again.

Saving and exporting codes in QR Studio needs an internet connection, so finish the export while you are online; the printed sheet works for your guests whether your phone is around or not.