What Is a VPN Kill Switch?

Virtual private networks — more commonly known as VPNs — provide great all-around protection for your privacy. They employ various technologies to safeguard your browsing activity, ensuring its confidentiality and maintaining your anonymity while surfing the internet.

For starters, VPNs encrypt all incoming and outgoing traffic from your devices to keep snoopers guessing what you’re up to. They also hide your IP address by redirecting your online traffic through secure VPN servers.

Those are the two main functions of a VPN, but they also offer secondary features that are just as useful. One of those features is a VPN kill switch. Here we’re shining a spotlight on it. What is a VPN kill switch? How does it work? Why do you need it? We’ll address all those questions in this guide.

VPN Kill Switch: What Is It?

A VPN kill switch is a simple backup measure that prevents you from accessing the internet when your connection is not secure. A VPN can protect your online privacy only when you’re connected through its secure tunnel, so a kill switch’s job is to make sure you’re connected to the encrypted tunnel before letting you surf the internet. If you happen to lose your connection, the VPN’s kill switch automatically logs you off public Wi-Fi to keep you protected. It kills your connection, hence the name “kill switch.”

Why a VPN Kill Switch Is Essential

Assuming you use a VPN to protect your online privacy and not just to change your Netflix region, for instance, a kill switch is a critical feature. Your VPN may not turn on automatically, but the kill switch compels you to switch it on.

Let’s paint a scenario: It’s 8 in the morning. You’ve just been through a hellish 30-minute commute. You sit in front of your desk and turn on your work computer. With a busy day ahead, you get to work right away. You write up an expense report, prepare for a presentation, send a confidential company file to your boss, and so on.

A couple of hours later, panic breaks out. There’s a spy in your network, and the file you sent earlier has just been leaked to your company’s rival. Your boss is sure she had her VPN turned on, so the leak couldn’t have come from her.

Furious, she comes knocking at your door with the IT guy, checks your computer, and, sure enough, confirms that the spy intercepted the file from your end. By lunch time, you’re heading home with a cardboard box of your personal belongings. If only you had a VPN kill switch.

That may be an unlikely scenario, but you get the point. A VPN kill switch may not directly protect your online data, but it ensures you take the right steps to avoid the consequences of an unsecure connection. That’s why a kill switch is essential.

Dropped VPN Connections and VPN Kill Switches

There’s another scenario in which a VPN kill switch may come in handy, and it happens more often than most people think. Having tested dozens of VPNs, we know that even the best VPNs can be unstable and erratic sometimes. Dropped connections are not uncommon, and when they happen, your device defaults back to an unsecure connection even if you’re in the middle of browsing.

The worst part? You may not notice it until it’s too late. Without a kill switch, you’ll be able to keep browsing through your unsecured connection, inadvertently leaking your browsing activity to your ISP and anyone who may be tracking you.

Here’s how much of a difference having a VPN kill switch makes. As soon as your VPN connection drops, the kill switch notices. It interrupts your device’s internet connection instantly, and you won’t be able to access anything online. The only way to restore your internet connection is to reconnect to the VPN.

Do All VPN Kill Switches Work the Same Way?

Not all VPN kill switches work the same way, and there’s variance in how each VPN uses a kill switch.

Some VPNs have a kill switch that prevents only the scenario in which your VPN connection drops and your device sends and receives traffic through an unsecure connection. NordVPN’s kill switch is an example of that model. When we reviewed NordVPN, the kill switch activated only when we connected to the VPN first and then the connection dropped. It didn’t prevent us from accessing the internet if we didn’t turn on the VPN in the first place.

Others have a kill switch that prevents absolutely all internet communications unless your connection is secure. If you don’t want to risk forgetting to turn on your VPN, this is a much safer option. Proton VPN’s permanent kill switch is a good example that was available on the Windows and Linux app when we tested Proton VPN.

If you have an Android smartphone or tablet running Android 7 or later, there’s also a built-in kill switch that works pretty much like the Proton VPN’s permanent kill switch. It’s called Always-on VPN1, and you can access it in the settings no matter which VPN you’re using.

1. Launch the Settings app.
2. Select “Network & internet.”
3. Tap “Advanced,” and then “VPN.”
4. Touch the gear icon next to the VPN service you’re using.
5. Toggle on Always-on VPN.

If you follow those steps, your phone or tablet will not connect to the internet unless you connect to the selected VPN first.

Are There Downsides to Using a Kill Switch?

We’ve pretty much established that having and using a VPN kill switch is essential, but are there any downsides? Like everything else when it comes to protecting your privacy, you may have to compromise if you want the added protection of a kill switch.

The biggest downside of using a kill switch is that, if it activates, it could disrupt whatever you’re doing online. That’s not much of a hassle if you’re only browsing. Just reconnect to the VPN and hit that reload button, and you’re back on track. It’s a different story, however, if you’re downloading a large file, playing an online game, or conferencing with your boss. In such scenarios, a VPN kill switch could seriously disrupt your flow.

There are a couple of solutions for that. First, find a reliable VPN. The kill switch interferes when the VPN connection drops, so select a VPN with a more reliable connection. That means having a tested and proven VPN protocol, a healthy number of servers, and fast speeds.

Second, find a VPN that lets you whitelist apps to exclude them from the kill switch’s effects. If you whitelist an app, it’ll be able to bypass the kill switch, allowing you to continue whatever you’re doing while the kill switch pauses everything else. Kill switch whitelisting is included in every NordVPN subscription, but it works only on Windows and macOS.2

Final Words

Having learned what a VPN kill switch is, what it does, and why it’s important, we’ve come to one simple conclusion: A VPN kill switch is essential to maintain your online privacy. Not all VPNs come with the feature, however, so compare VPNs before signing up for a service.