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There are many good reasons to get a VPN (Virtual Private Network) app installed on your phone or laptop: They make it harder for anyone else to track your browsing, they keep your data safe when you’re on public wifi networks, and they even let you spoof your location so you can access geolocation-locked content.

You’ll also find plenty of choice when it comes to VPNs. Our own guides to the best paid VPNs and the best free VPNs show the wealth of impressive apps out there, and even when you narrow down the criteria, you’ve still got lots of options to pick from—see our recommendations for the best free VPNs for Android.

So what exactly should you be looking for when it comes to choosing the right VPN for you? These are the features and selling points that you’ll see mentioned when you’re browsing VPN comparisons, and what they mean (and once you’ve built up a shortlist from these criteria, then you can look at the prices and extras).

Browsing speed

One of the downsides of loading up a VPN is that your browsing speed can suffer, while your data gets pinged around multiple servers across the globe. Ideally, you want all the protection that a VPN offers, without too much of a hit on download and upload rates (no matter how many other people are using the same VPN).

Unfortunately, this isn’t really something you can gauge just by looking at VPN listings and ads, as most VPNs will claim to be the fastest. Either read benchmark tests put together by publications and authors you trust (watch out for sponsored content), or make use of as many free trials as you can and do some testing yourself.

Server locations

Even VPN service will tell you how many servers it has, and where they are. Credit: ExpressVPN

Your VPN of choice needs to reroute your internet traffic somewhere, and how many servers a particular VPN has around the world can make a substantial difference to speed and availability. It’s also going to determine where in the world you can pretend to be of course, if you want to jump to another country virtually.

Broadly speaking, the more servers the better, though as with VPN speeds you may have to do some testing of your own to check reliability and transfer rates. Look for server locations close to you (for speed), and outside of heavily censored or surveilled countries (for privacy), and check any technical specs that are given for them.

Split tunneling and kill switches

Something else to look out for is split tunneling, or the ability to send only some of your internet traffic through a VPN. This means you get better speeds (and less security and privacy) on data that’s not so important, if you’re just reading the news or learning a language. It’s a feature that many of the best VPNs now offer.

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Another feature worth checking for is a kill switch. It sounds rather dramatic, but it’s simply a feature that shuts down your internet connection if the data encryption somehow fails—cutting you off from the internet, but preventing your connection and data from being exposed. Again, this is now fairly common, but not every VPN offers it.

No logs or zero logs

Mullvad VPN lets you pay by cash, if you don’t want to enter payment info. Credit: Mullvad VPN

You should only consider VPNs that have clear no-logs policies (no browsing data is permanently retained) or zero-logs policies (supposedly even stricter, covering more data). Don’t take the VPN’s word for it. though: Look for third-party audits from independent security companies, carried out regularly, to verify these claims.

If these logs are retained, they might be sold to data brokers, or pulled by law enforcement agencies—so check the individual privacy policies for details of what happens when you’re connected to your VPN. Some VPNs go above and beyond when it comes to letting you stay anonymous: Mullvad VPN lets you pay by cash through the post, for example.

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VPN protocol

A VPN protocol is the way that the VPN connects to the internet at large: It makes a major difference to speed and security, and you’ll often see it mentioned in VPN listings. However, as important as it is, it’s not something that’s easy to compare across different VPN services—most VPNs will simply say their protocol of choice is the best.

Once you’ve got a shortlist of VPNs together, do some background reading on the protocols they use: Look for independent assessments of their security and transparency, technical benchmarks, and protocols that have been open sourced so they can be analyzed. OpenVPN and WireGuard are two well-regarded protocols, for example.

Location and reputation

Where a VPN is based is important, as well as where it connects to. Credit: Lifehacker

VPN companies are bound by the laws and regulations of the country that they’re based in—so it’s a good idea to look for ones based in places where surveillance regulation and government monitoring is less strict. If necessary, check the VPN’s policies on how it deals with data requests from the authorities and law enforcement in its local region.

It’s also worth weighinga VPN company’s reputation: How does it make money? What other services does it offer? What’s its record with data breaches? This is much more important with a VPN than it is with your streaming music provider, for example, because you’re trusting it with all of your online data while you’re connected.

Trials and money back

Generally speaking, it’s worth paying for a VPN, as you’re giving it so much responsibility in terms of your online access and security. The paid options are almost always going to give you a faster and more reliable service, and if you regularly make use of a VPN then the monthly fee is well worth the investment.

It is, however, worth looking for services that offer free trials and your money back if you’re not satisfied (usually after 30 days). Not only does it reflect well on the VPN company, it means you can see if the VPN suits your needs—and check how fast its servers are—before signing up for any kind of payment plan.