How to protect your WhatsApp account from hackers

It’s important to be aware of who has physical access to your phone. If someone has physical access to your phone, they can use your WhatsApp account without your permission.
If you believe someone has scanned your QR code and has access to your account through WhatsApp Web and Desktop, you have the option to log out of all your active WhatsApp Web and Desktop sessions on your phone. To do so:
  1. Open WhatsApp on your phone.
    • Android: Tap 
      more options
      .
    • iPhone: Go to WhatsApp Settings.
  2. Tap Linked Devices.
  3. Tap a device > Log Out.
  4. Repeat these steps for all linked devices.
When you launch WhatsApp Web or Desktop, you can uncheck the option to Keep me signed in before scanning the QR code so your WhatsApp session will be logged out automatically after 15 minutes of inactivity.
Note: WhatsApp can't provide information about who accessed your account or the time and place of it.