Open WhatsApp
Tap the three dots in the top-right corner
Go to Settings
Tap Chats
Tap Chat backup and make sure your chats are backed up if needed
On Android, go to your phone’s Settings
Tap Apps
Tap WhatsApp
Tap Force stop
Tap Storage
Tap Clear data or Clear storage to log out
On iPhone, delete WhatsApp from the device to log out
If using WhatsApp Web or Desktop, open WhatsApp on your phone
Tap Linked devices
Select the device
Tap Log out