Open the Google app, Gmail app, or any Google service you are signed in to
Tap your profile picture in the top right corner
Select Manage your Google Account
Go to the Security tab if needed
Scroll to Your devices
Tap Manage all devices
Select the device you want to sign out from
Tap Sign out
Confirm the action if prompted
On a browser, go to Google Account settings
Open Security
Scroll to Your devices
Choose the device
Click Sign out
To log out of a browser completely, sign out from the Google site or close the session after signing out
On Android, remove the Google account from device settings if you want to sign out from the device
On iPhone or iPad, remove the Google account from the app or device settings if needed