WebRTC Leak: How Your VPN Gets Bypassed

Q: What is a WebRTC leak?

A WebRTC leak is when your browser built-in real-time communication feature reveals your real IP address to a website, even while you are using a VPN. WebRTC uses STUN servers to discover your network addresses, and that process can bypass the VPN tunnel.

Q: How do I test for a WebRTC leak?

Run a WebRTC leak test while connected to your VPN. If it shows your real public IP, or a local address like 192.168.x.x, your browser is leaking outside the VPN.

Q: How do I disable WebRTC?

In Firefox, set media.peerconnection.enabled to false in about:config. In Chrome and Edge, use a WebRTC-blocking extension or a VPN extension that handles it. In Brave, set fingerprinting protection to strict. Tor Browser disables WebRTC by default.

Q: Does a VPN stop WebRTC leaks?

Not always. Many VPNs do not block WebRTC by default. Some premium providers route or block STUN requests through their browser extensions, but plenty leave the leak open. Test your own setup rather than assuming, and disable WebRTC in the browser for certainty.

Q: Which browsers are affected by WebRTC leaks?

Chrome, Firefox, Edge, and Opera all enable WebRTC by default and can leak. Safari has more limited WebRTC support and fewer leak vectors. Tor Browser disables it entirely. Mobile browsers, especially Chrome on Android, are also affected.

~/sheets/webrtc-leak-explained.md

The Browser Feature That Betrays Your VPN
WebRTC (Web Real-Time Communication) is built into every major browser. It powers video calls, voice chat, and peer-to-peer file sharing. It also has a side effect that undermines your VPN: it can reveal your real IP address to any website that asks.
How WebRTC Leaks Work
WebRTC uses STUN servers to discover your network addresses for establishing peer-to-peer connections. This process operates outside the normal HTTP request flow, which means it can bypass your VPN tunnel and proxy settings. A simple JavaScript call can extract your real public and local IP addresses.
What Gets Exposed
A WebRTC leak can reveal your real public IP (the one your VPN is supposed to hide), your local private IP (like 192.168.1.x), and sometimes even your IPv6 address. This is enough to identify you, your network, and your approximate location. Test for WebRTC leaks now.
Which Browsers Are Affected
Chrome, Firefox, Edge, and Opera all have WebRTC enabled by default. Safari has limited WebRTC support with fewer leak vectors. Tor Browser disables WebRTC entirely. Mobile browsers are also affected, particularly Chrome on Android.
How to Prevent WebRTC Leaks
Firefox: Type about:config in the address bar and set media.peerconnection.enabled to false.
Chrome: Install the WebRTC Leak Prevent extension or use a VPN extension that blocks WebRTC.
Edge: Go to edge://flags and disable WebRTC features, or use an extension.
Brave: Go to Settings, then Shields, and set fingerprinting protection to strict mode.
VPN Provider Matters
Good VPN providers include WebRTC leak protection in their browser extensions. Some route STUN requests through the VPN tunnel. Others block WebRTC entirely when connected. If your VPN does not address WebRTC, consider switching providers.
Verify After Every Change
After applying fixes, always verify with our WebRTC Leak Test. Browser updates can reset your settings. New extensions can re-enable WebRTC. Test regularly to maintain your privacy. Complement this with a DNS leak test and a browser fingerprint check for comprehensive protection. Start by confirming your public IP address is hidden.
Frequently Asked Questions
What is a WebRTC leak?
A WebRTC leak is when your browser built-in real-time communication feature reveals your real IP address to a website, even while you are using a VPN. WebRTC uses STUN servers to discover your network addresses, and that process can bypass the VPN tunnel.
How do I test for a WebRTC leak?
Run a WebRTC leak test while connected to your VPN. If it shows your real public IP, or a local address like 192.168.x.x, your browser is leaking outside the VPN.
How do I disable WebRTC?
In Firefox, set media.peerconnection.enabled to false in about:config. In Chrome and Edge, use a WebRTC-blocking extension or a VPN extension that handles it. In Brave, set fingerprinting protection to strict. Tor Browser disables WebRTC by default.
Does a VPN stop WebRTC leaks?
Not always. Many VPNs do not block WebRTC by default. Some premium providers route or block STUN requests through their browser extensions, but plenty leave the leak open. Test your own setup rather than assuming, and disable WebRTC in the browser for certainty.
Which browsers are affected by WebRTC leaks?
Chrome, Firefox, Edge, and Opera all enable WebRTC by default and can leak. Safari has more limited WebRTC support and fewer leak vectors. Tor Browser disables it entirely. Mobile browsers, especially Chrome on Android, are also affected.
Last updated: April 2026