On Windows, open Settings, go to Network & Internet, then Wi-Fi, then Hardware properties or Network and Sharing Center, and view the saved Wi-Fi password in Security settings
On Mac, open Keychain Access, search for the Wi-Fi network name, open it, and check Show password
On iPhone, go to Settings, then Wi-Fi, tap the network name, and view the password if your iOS version supports it
On Android, open Wi-Fi settings, select the connected network, and view or share the password if your device supports it
On a router, check the label on the device for the default Wi-Fi password
On a router admin page, sign in through a browser and check the wireless settings for the current password
On a saved device, use the device’s Wi-Fi sharing or password display option if available
If you cannot find it, reset the router and set a new Wi-Fi password