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What Is a WebRTC Leak?

WebRTC is a powerful browser technology that enables real-time communication — but it also has privacy implications that many users aren't aware of. A WebRTC leak can reveal your real IP address even when you're connected through a VPN. This guide explains what WebRTC is, how leaks occur, and what you can do about it.

By IP Tester Editorial Team · Updated September 9, 2026

What Is WebRTC?

WebRTC (Web Real-Time Communication) is a free, open-source technology that allows browsers to communicate directly with each other for voice calls, video chats, screen sharing, and file transfers — all without requiring plugins or external software. WebRTC is used by popular services like Google Meet, Discord (in browser), and many other video conferencing and streaming platforms. It's built into all major modern browsers including Chrome, Firefox, Safari, and Edge.

How WebRTC Leaks Happen

To establish direct peer-to-peer connections, WebRTC needs to discover your device's network addresses. It uses a protocol called ICE (Interactive Connectivity Establishment) which queries STUN servers to discover your public IP address. The privacy problem arises because WebRTC performs these connection checks independently of your browser's proxy and VPN settings. This means that even when your VPN is active and encrypting all regular traffic, WebRTC can still send requests that reveal your real IP address to STUN servers — and potentially to any website that uses the WebRTC API. Additionally, WebRTC can reveal your local/private IP address (like 192.168.x.x), which tells websites which network you're connected to.

Browser Protections

Different browsers handle WebRTC privacy differently:

  • Firefox — Has the strongest protections. By default in private browsing, it blocks non-proxied WebRTC connections. In regular browsing, you can configure media.peerconnection.enabled in about:config
  • Chrome — Shows warnings but generally still exposes local IPs. You can disable WebRTC by going to chrome://flags and setting "WebRTC IP handling policy" to disable non-proxied UDP
  • Safari — Has implemented restrictions on WebRTC IP exposure in recent versions
  • Edge — Uses the same Chromium engine as Chrome and has similar behavior

How to Test

Visit our WebRTC Leak Test page to check whether your browser is exposing local IP addresses through WebRTC. The test uses standard browser APIs to check for IP exposure — no plugins or external software required.

How to Prevent WebRTC Leaks

Methods to prevent WebRTC IP exposure:

  • Disable WebRTC in your browser — the most reliable method, though it may break some web features
  • Use a browser with strong WebRTC protections — Firefox is generally the best choice for privacy
  • Install browser extensions — extensions like uBlock Origin can help block WebRTC leaks
  • Use a VPN with WebRTC protection — some VPNs modify WebRTC settings to prevent leaks
  • Use a privacy-focused browser — Tor Browser blocks WebRTC entirely
Keep in mind that completely disabling WebRTC will prevent some web features from working, including in-browser video calling.

Frequently Asked Questions

Yes. This guide is written by the IP Tester editorial team and reviewed for accuracy. However, technology evolves, so details may change over time. Always check the publication date for currency.
Check our other guides for more in-depth articles on networking and privacy topics.

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Written by IP Tester Editorial Team | Last updated: September 9, 2026