How to share Wi-Fi access with a QR code
A WiFi QR code carries the network name, the password and the encryption type in one image, so a guest joins by pointing a camera instead of typing a long password. The template on the generator assembles the payload for you — this guide covers what goes inside it, what breaks it, and how to print one that scans first time.
What is inside a WiFi QR code
A WiFi QR code is not a link. It is a short instruction written in a fixed format that phones understand: the network name, the password, and the encryption type, separated by semicolons. A typical payload looks like this:
WIFI:S:CafeGuest;T:WPA;P:correcthorsebatterystaple;;
Read it left to right: join the network called CafeGuest, it uses WPA encryption, and the password is everything after P:. The two trailing semicolons close the record. The generator's Wi-Fi template builds exactly this string from three fields and drops it into the QR Content box, where you can read it before generating.
The password is readable by anyone. The code stores the password in plain text, not as a secret. Photographing your table tent reveals it as easily as typing it would. That is fine for a guest network and wrong for anything you would not say out loud — keep this technique on networks you are happy to share.
How to make one in under a minute
- Open the generator and pick the Wi-Fi template. It asks for the network name exactly as the router broadcasts it, including capital letters and spaces.
- Type the password exactly. Passwords are case sensitive, and a trailing space counts as a character. Copy it from the router sticker rather than from memory.
- Set the encryption type to match the router. Most home and cafe routers use WPA or WPA2. A code that names the wrong type fails to join even with the right password.
- Read the QR Content box. It shows the finished payload, with a live character counter. Confirm the name and password there before styling anything.
- Leave error correction at High and export for print. Vector SVG for a designer, or the 1024 pixel Ultra Print PNG for a straight print. Then scan it with a real phone before you print a batch.
Where it works, and where it does not
| Situation | What happens | Notes |
|---|---|---|
| Modern phone camera | Shows a Join prompt immediately. | No extra app needed on current phones. |
| Wrong encryption type | Join fails. | The password was right; the type did not match the router. |
| Open network, no password | Joins with no password field. | Leave the password empty in the template. |
| Password changed later | Old prints stop working. | The password is baked into the image; reprint after a change. |
| Hidden network | Phone dependent. | Some phones join, some ignore the code; test yours first. |
| Desktop or laptop webcam | Varies. | Most guests will use a phone; that is the case to optimise for. |
Limits worth knowing
- Anyone can read the password out of the image. Decoding a QR code takes seconds with any scanner, so a printed code is a published password.
- Special characters in the name need care. A semicolon, comma or colon inside the network name or password can confuse strict parsers. Test the printed code on more than one phone brand.
- Long passwords make denser codes. A 60-character password still fits, but the denser matrix needs a larger print to scan reliably at arm's length.
- Changing the network means reprinting. A new name, password or encryption type needs a fresh code on every sign that carries one.
Frequently asked questions
How does a guest join my Wi-Fi from the QR code?
They point their phone camera at the code. The phone reads the network name, password and encryption type from the payload and shows a Join button, so nobody types the password by hand.
On most phones no extra app is needed.
What exactly is stored inside a WiFi QR code?
Three things: the network name, the password in plain text, and the encryption type, written as WIFI:S:name;T:type;P:password;;.
Anyone who photographs the printed code can read the password from it, so treat the printout the way you would treat the password itself.
Which encryption type should I pick in the template?
Pick the type your router actually uses, usually WPA or WPA2. If the code says one type and the network uses another, the phone refuses to join even though the password is right.
Open networks need no password field at all.
How large should I print a WiFi QR code?
Print it at least a few centimetres across for a counter sign and test it with a real phone at the distance guests will stand. Vector SVG stays sharp at any size, and the 1024 pixel Ultra Print PNG suits a straight print.
Keep error correction at High so the code survives glare and wear.
What happens when I change the Wi-Fi password?
Every printed code stops working, because the old password is baked into the image. There is nothing to update remotely.
Generate a fresh code with the new password and reprint the signs.