With current (Android) mobiles it is possible to add a WiFi network by scanning a QR-code. Barcode Scanner by ZXing Team is one of the apps recognizing the WiFi QR-codes. Other QR-code generators online (that support WiFi-QR) generate the QR-code server side, which means the data, including the password, is sent over the internet. Since I wasn't comfortable with this, I have created an open source Javascript alternative.
http://qistoph.github.io/WiFiQR/
Use this generator to generate a QR-code without having your precious WiFi information sent over the internet. Such a QR-code might, for example, be useful to allow your guests to easily add your WiFi network to their phone when visiting.
Usage
Select the encryption used in your network (WEP, WPA or none).
Enter your SSID.
Enter the password for the network.
If the SSID is hidden, set the visibility button to 'Hidden'.
Click 'Generate' and/or 'Print'
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