Whenever you connect to a WiFi network and enter the password to connect to that network, a WLAN profile of that WiFi network is made. That profile is stored inside the computer along with the other required details of the WiFi profile.
Instead of using a GUI to find the individual passwords, we can also look for the WiFi password of that particular WiFi network using cmd. These steps work even when totally offline or not connected to the particular WiFi.
1. Open command prompt and run it as administrator.
2. View all profiles stored on computer by typing: netsh wlan show profile (this command will list all WiFi profiles connected to).
3. To see the password for a network type the following: netsh wlan show profile [SSID] key=clear
Under Security Settings, in the key content entry, you will see the password of the specified network.
Reference: Shekhar, Amar. “How To Find Wi-Fi Password Using CMD Of All Connected Networks”. fossBytes. N.p., 2016. Web. 13 Oct. 2016.