How to detect if someone is spying on your WhatsApp, step by step

Since WhatsApp added the ability to use the same account on multiple devices two years ago, cases of spying on private conversations began to multiply.

This feature, designed to make the app easier to use on additional tablets, computers, and phones, was also exploited by third parties to access messages without authorization .

Cybersecurity specialists warn that, in general, people less familiar with technology are the most vulnerable to this type of intrusion.

Spying can take many forms, from the simplest—performed through the app's native functions —to the most sophisticated, requiring the installation of spyware on the victim's device.

The most common way , experts say, is done without external applications and can be detected and controlled directly from WhatsApp .

WhatsApp allows you to link up to four additional devices to the same account, maintaining full message synchronization . This means that any messages sent or received on the primary phone are also reflected on the additional devices.

This functionality can be leveraged by third parties to monitor conversations without the account owner being aware of it .

To identify unauthorized access, it is recommended to go to the app menu on the chat screen and select “Linked Devices.”

All devices currently logged in are listed there. If the user recognizes each of them, there is no risk. However, if an unknown device appears, the recommended course of action is to select Sign Out , which immediately blocks access to the account from that device.

This measure protects privacy without compromising legitimate use of the app on other devices.

Remote access via spyware is a more complex and difficult-to-detect threat. This type of intrusion typically requires physical access to the phone or sophisticated remote procedures .

Signs that a device may be compromised are often indirect: faster-than-usual battery drain , an overheating phone, or unexpected app behavior .

If you suspect spyware has been installed, computer security authorities recommend resetting your phone to factory settings .

This procedure removes any malware and allows you to reinstall only the necessary apps, preserving any photos and videos you want to keep. According to experts, this is the safest method to ensure that no trace of spyware remains on your device.

Spying on private conversations can be a serious crime, with fines and even prison sentences. Therefore, closing unknown sessions and, if malware is suspected, resetting your device is the most effective way to protect your privacy and regain control over your WhatsApp account.