Why VPN Protocols Matter
A VPN protocol is the set of rules that determines how your device creates and maintains the encrypted tunnel to the VPN server. Different protocols make different trade-offs between speed, security, battery consumption, and compatibility. The protocol your VPN app selects by default has a real impact on your experience.
WireGuard
WireGuard is the newest major protocol and the current standard for most use cases. It has a much smaller codebase than OpenVPN (around 4,000 lines vs 400,000+), which makes it faster to audit for security vulnerabilities and faster to establish connections. Speed tests consistently show WireGuard outperforming OpenVPN on the same hardware by 20 to 50 percent. Battery consumption on mobile devices is also noticeably lower. Most premium VPN providers now support WireGuard or a proprietary protocol built on it (NordVPN's NordLynx, ExpressVPN's Lightway).
OpenVPN
OpenVPN has been the industry standard for over 15 years. It is highly configurable, well audited, and works on essentially every platform. The downside is that it is slower than WireGuard and takes longer to establish connections. It is still a good choice when you need maximum compatibility or are using an older VPN service that has not yet implemented WireGuard.
IKEv2/IPsec
IKEv2 is particularly well suited for mobile devices. It handles network switching (from Wi-Fi to cellular and back) without dropping the VPN connection, which is called MOBIKE support. Connection re-establishment after a network change is nearly instant. If you use a VPN primarily on a phone and switch networks often, IKEv2 is worth considering even if WireGuard is available.
Which Protocol to Choose
For desktop use: WireGuard if available, OpenVPN as a fallback. For mobile: IKEv2 if you switch networks frequently, WireGuard otherwise. If your VPN provider offers an auto-select option and uses WireGuard-based infrastructure, auto-select is usually fine. Manual selection is worth doing if you notice consistent speed or connection stability issues.
Protocols to Avoid
PPTP is outdated and should not be used for anything sensitive. L2TP/IPsec is older and slower than the alternatives listed above. Some VPN providers still offer these for compatibility with legacy systems, but they are not appropriate for privacy or security use cases in 2026.