There are many websites out there that will gladly take the details of your wifi network and in exchange for receiving those details, will generate an QR code that you can use to allow others easy access to your guest network, or business wifi. I strongly recommend against use of such sites as you can’t be sure they aren’t mining the data to build a repository of such information, and for what other purposes.
Instead, I used a freely available tool in Linux known as qrencode. Fortunately, qrencode is a simple program that you run locally on your linux machine (hell you could even roll up a linux VM to do this if you don’t have a machine with linux on it).
Installing qrencode in debian or ubuntu is as easy as:
sudo apt install qrencode
Once you have it installed, the format for generating the QR code is pretty straightforward:
qrencode -l H -t PNG -o qrwifi.png "WIFI:S:{SSID name of your network};T:{security type - WPA or WEP};P:{the network password};;"
So say your wifi name is “FBI VAN” with a password of “b0nehead” and has WPA encryption, your command to generate the QR would look like this:
qrencode -l H -t PNG -o qrwifi.png "WIFI:S:FBI VAN;T:WPA;P:b0nehead;;"
You would then see this QR code generated: (go ahead, scan it here!)
Once done, you have a nice QR code you can print and display for your guests. This makes it easy to get them connected, and they don’t have to worry about bothering anyone for the wifi password anymore. It’s a win on both sides.
