Windows remembers every Wi-Fi password you’ve ever used. That’s how it reconnects to those networks. Here’s how you can view the saved password of any network you’ve ever connected to on your Windows PC.
Download NirSoft’s WirelessKeyView
You can view saved passwords with built-in command-line tools in Windows, but we recommend NirSoft’s free WirelessKeyView application. It’s a lightweight tool you don’t even have to install to use—just download it, open the ZIP file, and then double-click the included EXE file (if you have file extensions hidden, open the “WirelessKeyView” application file). You’ll then see a list of saved network names and their passwords stored in Windows.
The “Network Name” column shows the name of the Wi-Fi network—in other words, its SSID. To find the password associated with a network, look under the “Key (Ascii)” column for that network name. This is the password you type to connect to that network.
To back up this information, you can select File > Save All Items. You’ll get a text file containing this information, so you can take it with you to a new PC or store it for later.
Use the Command Line
Windows 10’s standard Control Panel only lets you see the password of the Wi-Fi network you’re currently connected to. If you don’t want to download third-party software, you’ll have to use command line tools to discover this information.
To find a password on Windows without third-party software, open a Command Prompt or PowerShell window. To do this, right-click the Start button or press Windows+X, and then click “PowerShell.”
Run the following command to see the list of saved network profiles on your system:
Look for the name of the network you need the password for, and then run the following command, replacing “NETWORK” with the name of that network:
Look under “Security Settings” in the output. The “Key Content” field displays the Wi-Fi network password in plaintext.
Repeat this process for each Wi-Fi network you want to find the password for.
If you don’t have it saved in Windows, there are many other ways you can find a forgotten Wi-Fi password, including on another device (like a Mac), in a router’s web interface, or even printed on the router itself.
More Information: howtogeek.com