VPN Leak Check

Use our free tool to check whether your VPN is properly protecting your online identity.

A VPN is supposed to hide your real IP address and encrypt your traffic — but many VPNs suffer from leaks that expose your true location and browsing activity. This test checks the most common vulnerability points: DNS leaks, WebRTC leaks, and IP address inconsistencies.

Click the button below to run a comprehensive leak test. No signup required. Results appear in seconds.

Tests DNS, WebRTC, and multiple IP sources simultaneously. Takes ~5–10 seconds.

What is a VPN Leak?

A VPN leak occurs when your real IP address, DNS queries, or other identifying information bypasses your VPN tunnel and is exposed to websites, your ISP, or third-party observers. Even with an active VPN connection, these leaks can reveal your actual location, identity, and browsing habits — completely defeating the purpose of using a VPN in the first place.

The most common types of VPN leaks are DNS leaks, where your domain name lookups go through your ISP's DNS servers instead of the VPN's secure DNS; WebRTC leaks, where browser WebRTC features expose your local network IP addresses; and IP address leaks, where some traffic routes outside the VPN tunnel due to misconfiguration or software bugs.

Why Do VPN Leaks Happen?

VPN leaks can happen for several reasons:

Misconfigured VPN client — The VPN software isn't set up correctly, allowing certain traffic to bypass the tunnel.
DNS server fallback — The system falls back to your ISP's default DNS when the VPN's DNS is slow or unreachable.
WebRTC in browsers — Chrome, Firefox, and other browsers use WebRTC for video calls and chat, which can expose your real local IP even behind a VPN.
IPv6 leakage — Some VPNs only tunnel IPv4 traffic, leaving IPv6 connections exposed through your normal internet connection.
Kill switch failure — If your VPN disconnects unexpectedly and the kill switch doesn't activate, all traffic flows unencrypted.
App-level whitelisting — Some VPN "split tunneling" features accidentally exclude apps that should be protected.

How Does This Leak Detection Tool Work?

This tool performs three independent tests simultaneously:

IP Cross-Check — We query multiple public IP detection APIs (freeipapi, ip.sb, ipwho.is, ipinfo.io) and compare the results. If all APIs return the same IP, your connection is consistent. If different IPs appear, you may have a routing leak or proxy inconsistency.
DNS Leak Test — We perform DNS lookups via Google's secure DNS-over-HTTPS (DoH) service and analyze whether your DNS requests could be intercepted or logged by comparing response patterns. A proper VPN should route all DNS through its own encrypted DNS servers.
WebRTC Leak Test — We use the browser's WebRTC API to request STUN candidates from Google's public STUN server. This reveals any local network IPs (including your real WAN IP) that WebRTC might expose to websites using peer-to-peer features.

All tests run entirely in your browser. No data is sent to our servers except the standard API calls used for IP detection, which are the same calls any website can make.

How to Fix VPN Leaks?

If this tool detects a leak, here's how to fix it:

Enable DNS leak protection — Most premium VPN clients have a "DNS leak protection" toggle. Make sure it's turned on.
Disable WebRTC in your browser — Install a WebRTC blocking extension or disable WebRTC in browser settings (about:config in Firefox, chrome://flags in Chrome).
Enable the kill switch — Ensure your VPN's kill switch is active so no traffic leaks if the VPN disconnects.
Choose a VPN with IPv6 support — If you have an IPv6 connection, make sure your VPN tunnels both IPv4 and IPv6 traffic.
Disable IPv6 system-wide — If your VPN doesn't support IPv6, disabling it at the OS level prevents IPv6 leaks.
Update your VPN client — Outdated VPN software may have known leak vulnerabilities. Always keep it updated.
Test after each change — Re-run this tool after making changes to verify the leak is fixed.

Recommended VPNs with Built-in Leak Protection

When choosing a VPN, look for providers that offer:

Built-in DNS leak protection (custom DNS servers)
WebRTC leak blocking at the network level
IPv6 leak protection
A working kill switch
Independent audit reports confirming no leaks

The best way to stay safe is to combine a reputable VPN with regular leak testing. Bookmark this page and run a quick check whenever you connect to a new network or suspect something might be wrong.