How to revoke all devices you have been using your mail?

You can revoke the device either using a PC or a Mobile device.

-First using PC

1. Go to your Google Account.
2. On the left navigation panel, select Security.

   
3. On the Your devices panel, select Manage devices.
4. You’ll see devices where you’re currently signed in to your Google Account, Select the device  Sign out.
   

-Or using Mobile Phone

• Go to your Mobile settings.

• Open Google

• Open “Manage Your Google Account”.

• Go to “Security”.

• select Manage devices.

• Select the device  Sign out.