Why Public Wi-Fi Remains Dangerous
Most public Wi-Fi networks at airports, cafes, and hotels are unencrypted or use shared passwords. On these networks, anyone else on the same network can potentially observe unencrypted traffic. While HTTPS has dramatically reduced the risk of content sniffing (most sites encrypt data in transit), metadata, DNS queries, and traffic to legacy non-HTTPS endpoints remain exposed.
The Evil Twin Attack
A more targeted risk is the evil twin: a rogue access point with the same name as the legitimate network. Your device connects automatically. The attacker controls all traffic through their device. A VPN prevents this attack from succeeding because all traffic is encrypted before it leaves your device -- the attacker sees only encrypted VPN packets.
What a VPN Actually Protects
On public Wi-Fi, a VPN encrypts your traffic between your device and the VPN server, preventing local network observers from reading it. This includes: DNS queries (what sites you are looking up), metadata about which servers you connect to, traffic to any non-HTTPS endpoint, and VoIP calls or video streams that may not encrypt end-to-end by default.
What a VPN Does Not Protect
A VPN is not a complete security solution. It does not protect against: malware already on your device, phishing attacks, compromised HTTPS certificates at the server end, or data collection by the VPN provider itself. Choose a VPN with a verified no-logs policy if privacy from the provider matters.
Best VPNs for Public Wi-Fi in 2026
NordVPN, ExpressVPN, and Mullvad are consistently rated highest for public Wi-Fi use because they have strong encryption standards, automatic kill switches (cutting internet if the VPN drops), and verified no-logs policies. Enable the kill switch before connecting to any public network -- this ensures your traffic never leaks to the local network even if the VPN connection drops momentarily.