What is WebRTC leak prevention?

WebRTC (Web Real-Time Communication) can reveal your real IP address even when using a VPN or proxy. WebRTC is a browser API for peer-to-peer connections (video calls, file sharing). During connection setup, it discovers all available network interfaces — including your real local and public IP addresses — and can expose them to websites via JavaScript. How the leak works: a website runs JavaScript that creates a WebRTC peer connection. The browser collects ICE candidates (network endpoints) that include your real IP. The website reads these candidates and now has your IP, bypassing your proxy. Prevention: 1) Browser settings — Firefox: set media.peerconnection.enabled to false in about:config. Chrome: no built-in disable option. 2) Extensions — WebRTC Control, uBlock Origin (with WebRTC toggle). 3) Anti-detect browsers — Multilogin, GoLogin, and others block or modify WebRTC to report proxy IP instead of real IP. This is the most reliable solution for operations. 4) System-level VPN — a VPN that handles WebRTC at the network level (not browser level) prevents leaks because there is no alternative IP to discover. Test for leaks: visit browserleaks.com/webrtc or ipleak.net. If you see your real IP alongside your proxy IP, you have a leak.