The free WiFi in your local café, the airport lounge or a Dublin hotel is convenient, and it is also wide open. You are sharing that network with strangers, the connection is often unencrypted, and a fake hotspot called “Free Airport WiFi” takes minutes to set up. On a network you do not control, anyone nearby can try to read what you send. A VPN fixes this in one move: it wraps all your traffic in an encrypted tunnel before it touches the WiFi, so even on a hostile or fake network there is nothing readable to steal. It is the single most effective thing you can do to stay safe on public WiFi.
Our top pick is NordVPN. It pairs a reliable kill switch and auto-connect with built-in Threat Protection that blocks malware and trackers, so the moment your phone joins an unknown network you are covered without thinking about it. ExpressVPN is the polished, set-and-forget runner-up; Surfshark is the value pick that still ships every security feature that matters here; and Proton VPN is the choice for the privacy-first crowd.
Below we explain the actual attacks public WiFi exposes you to, exactly how a VPN shuts them down, the features worth checking before you trust one, and which providers we rank for the job. For the risks in plain terms, see is public Wi-Fi safe.
Why public WiFi is genuinely risky
This is not scaremongering — the risks are specific and well understood. Because open WiFi is shared and frequently unencrypted, the network itself becomes a place where your data is exposed to other people on it. Here are the real attacks:
- Packet sniffing. On an unencrypted network, others connected to the same WiFi can passively capture the traffic flowing over the air — the digital equivalent of someone listening in on everything you send and receive.
- Evil-twin hotspots. An attacker stands up a fake access point with a friendly name — “Free Airport WiFi”, “Hotel Guest” — and waits for you to connect. You think you are on the venue’s network; in reality you are routing everything through the attacker’s laptop.
- Man-in-the-middle. Whether through an evil twin or a compromised router, the attacker sits between you and the sites you visit, able to read, alter or redirect what passes through.
“But HTTPS encrypts everything now” is the usual reply, and it is only half true. HTTPS protects the contents of many connections, but not all of it. Your DNS lookups (which sites you are asking for) can still leak, some apps do not use HTTPS properly, and the simple fact of which sites you visit is often visible. Worse, a hostile network can try to downgrade a secure connection or spoof one to trick you. HTTPS is a good lock on individual doors; it does not protect the whole building.
How a VPN shuts the risk down
A VPN solves the problem at the root. Instead of trusting the network not to be hostile, you stop trusting it at all. Every packet that leaves your device is encrypted before it reaches the WiFi, then travels through a tunnel to the VPN’s server, where it rejoins the open internet.
The practical effect on an untrusted network is total. The café router, the evil twin, the person sniffing packets at the next table — all of them see is a stream of scrambled data going to a single server. There is no readable traffic to capture, no DNS lookups to spy on, no way to insert themselves in the middle of a connection they cannot read. The attacks above simply have nothing to bite on.
This is the key distinction from why people use a VPN abroad or for work. Here it is not about the country you are in or the job you are doing — it is about the network itself. A VPN turns any untrusted WiFi into something as safe as your own connection, which is exactly why it is the single most effective protection on public WiFi.
It is worth saying plainly: a VPN is legal and entirely above board for this. If you are wondering about the rules, see are VPNs legal in Ireland — the short answer is yes.
The features that matter
Encryption is the foundation, but a few features decide whether a VPN actually protects you in the messy reality of joining and leaving networks all day. These are the ones we check for public WiFi:
Kill switch
If the VPN connection drops for a moment — a weak signal, a server hiccup — a kill switch cuts your internet entirely rather than letting traffic fall back onto the bare WiFi. Without it, a brief drop quietly exposes you on exactly the network you were trying to avoid. All of our picks include a kill switch; on public WiFi it is non-negotiable.
Auto-connect on untrusted WiFi
The best protection is the one you cannot forget. Auto-connect turns the VPN on the instant you join a new or unknown network, so there is no window where you are sitting on open WiFi unprotected because you were distracted ordering a coffee. Set it once and the decision is made for you, every time.
Threat protection
Some providers add a layer that blocks malware, malicious sites and trackers at the network level — NordVPN’s Threat Protection is the standout example. On public WiFi, where you are more likely to be steered toward a dodgy page, that extra filtering is genuinely useful and runs quietly in the background.
On your phone — where you’re most exposed
If you only set this up in one place, make it your phone. Your laptop tends to sit on networks you chose deliberately; your phone hops onto café and airport WiFi automatically the moment it is in range, often before you have even taken it out of your pocket. That is precisely where the exposure lives — on the device that joins untrusted networks without asking.
So the rule is simple: enable auto-connect on mobile. With it on, the VPN spins up the second your phone touches a new network, and the kill switch covers any drop. You get protection that is always-on without any daily effort. iPhone users can follow our setup notes in the best VPN for iPhone guide.
And this is not only a holiday concern. You want the same protection out and about at home in Ireland — the coffee shop down the road, the train, the hotel bar — not just when you are abroad. The network does not have to be foreign to be untrusted.
How we ranked the VPNs for public WiFi
For this page we weighted the features that actually keep you safe on networks you do not control, rather than streaming libraries or marketing claims. Specifically, we looked at:
- A dependable kill switch on every platform, especially mobile — the safety net when the connection blips.
- Auto-connect on untrusted or unknown WiFi, so protection is automatic and you cannot leave a gap.
- Threat protection — built-in blocking of malware, malicious sites and trackers as a meaningful bonus.
- Strong, modern encryption and a solid track record on privacy, so the tunnel you are trusting is worth trusting.
- A genuinely good mobile app, because the phone is the device most at risk.
The order below follows our overall provider scores, then we call out where each one shines for this specific job. For the broader picture across every category, our best VPN Ireland roundup has the full table.
Our top picks for public WiFi
1. NordVPN — best overall for public WiFi
NordVPN takes the top spot because it does everything this job needs and does it well. The kill switch is reliable, auto-connect on untrusted networks is easy to set, and Threat Protection adds a layer of malware and tracker blocking that genuinely matters on dodgy networks. Fast, polished and trustworthy — read the full NordVPN review for the detail.
2. ExpressVPN — the set-and-forget runner-up
ExpressVPN is the option you configure once and stop thinking about. The apps are exceptionally clean, the kill switch (Network Lock) is rock-solid, and auto-connect behaves itself across devices. If you want something that just works without fuss, it is the easy pick — see our ExpressVPN review.
3. Surfshark — the value pick
Surfshark ships every security feature that matters here — kill switch, auto-connect, threat-blocking tools — at a noticeably lower price, plus unlimited simultaneous connections so you can cover the whole household’s phones and laptops on one plan. The best balance of protection and cost.
4. Proton VPN — the privacy-first choice
For people who put privacy above all, Proton VPN is the one. Independently audited, transparent and based on a strong privacy ethos, with the kill switch and modern encryption you need on untrusted WiFi. The choice when trust in the provider itself is the priority.
5. IPVanish & 6. CyberGhost
Both round out the list as solid, capable options with the core protections — a working kill switch and the encryption that does the heavy lifting on public WiFi. They sit lower simply because our top four edge them on the mix of features, apps and overall polish, not because they fall short on the fundamentals.
Heading away with one of these? Pair this advice with our best VPN for travel guide for the trip-specific side of things.