Guides / What Is a VPN Kill Switch?
What Is a VPN Kill Switch?
A kill switch is one of the most important VPN features, yet many people never turn it on. Its job is simple but vital: if your VPN connection drops for any reason, the kill switch instantly blocks all internet traffic so nothing slips out unprotected. Without it, a brief disconnect can expose your real IP address and unencrypted data without you ever noticing.
Why connections drop
VPN connections are not always perfectly stable. They can drop when your Wi-Fi flickers, when you switch networks, when your device wakes from sleep, or when a server is briefly overloaded. These interruptions often last only a second or two — long enough for apps to leak data over your normal connection.
How the kill switch protects you
When the kill switch is active, your device is only allowed to send traffic through the encrypted VPN tunnel. The moment that tunnel goes down, the switch cuts off all internet access until the VPN reconnects. You might see a brief loading pause, but your real IP and data never leak in the gap.
App-level vs system-level
Some apps offer a system-wide kill switch that blocks everything, and others let you choose specific apps to protect. System-wide is the safest default. App-level is useful if you only want certain programs — like a torrent client or browser — to stop when the VPN drops.
How to turn it on
Open your VPN app's settings, find the kill switch or network lock option, and enable it. On some platforms you also grant a permission that lets the app manage your connection. Once enabled, test it by manually disconnecting the VPN and confirming your internet stops until you reconnect.
Pair it with leak protection
A kill switch works best alongside DNS and IPv6 leak protection. Together they close the small gaps that can otherwise reveal what you are doing even while connected. Enable all three and your setup is genuinely robust.