What Is WebRTC?
WebRTC (Web Real-Time Communication) is an open-source technology built into modern browsers that enables real-time audio, video, and data communication directly between browsers — without needing a plugin or third-party software. It powers video calls on Google Meet, voice chat in Discord's browser version, and peer-to-peer file sharing tools.
WebRTC is genuinely useful. But it has a serious privacy flaw: to establish a direct peer-to-peer connection, your browser must discover and share your IP addresses — including your real public IP address. This happens even when you are connected to a VPN.
What Is a WebRTC Leak?
A WebRTC leak occurs when your browser reveals your real IP address through WebRTC's ICE (Interactive Connectivity Establishment) protocol, bypassing your VPN tunnel. The website or peer you are communicating with — or any JavaScript running on the page — can read these IP addresses using simple browser APIs.
This is not a bug in WebRTC. It is by design. WebRTC needs your real IP to function correctly. The problem is that this design decision conflicts with the privacy expectations of VPN users. You might think your VPN is hiding your identity, but WebRTC is quietly broadcasting your home IP address to any webpage that asks for it.
WebRTC leaks are particularly dangerous because they are invisible. There is no error message, no warning, no indicator that your real IP is being exposed. You continue browsing believing you are anonymous, while your true location is fully visible.
How Does a WebRTC Leak Happen?
When two browsers want to connect via WebRTC, they go through a process called ICE candidate gathering. During this process, the browser collects all available network interfaces and IP addresses — including local network addresses (192.168.x.x), your public IP address, and sometimes even your IPv6 address.
These ICE candidates are then shared with the other party to find the best possible connection route. Any JavaScript on a webpage can trigger this process and read the results using the RTCPeerConnection API. This means any website you visit can potentially discover your real IP address through WebRTC — not just video call applications.
Here is a simplified example of how a website does it:
That is all it takes. Any webpage running this code in the background can collect your IP addresses without any visible indication to you.
Types of WebRTC Leaks
Public IP Leak
The most critical type. Your real public IP address — the one assigned by your ISP — is exposed. This completely defeats the purpose of using a VPN for anonymity and can be used to identify your geographic location, ISP, and potentially your identity.
Local IP Leak
Your local network IP (e.g. 192.168.1.5) is revealed. While this is less dangerous on its own — local IPs are private and not globally routable — it can be used for browser fingerprinting to track you across sessions and websites.
IPv6 Leak
If your network supports IPv6 and your VPN does not route IPv6 traffic, your real IPv6 address may be leaked. IPv6 addresses are globally unique and directly tied to your network, making this as serious as a public IP leak. Many users are unaware that their connection uses IPv6 at all.
Which Browsers Are Affected?
WebRTC is enabled by default in all major browsers:
Google Chrome — WebRTC is deeply integrated and cannot be fully disabled without an extension
Mozilla Firefox — Has a built-in setting to disable WebRTC
Microsoft Edge — Based on Chromium, same behavior as Chrome
Opera — Based on Chromium, affected by the same leaks
Brave — Has built-in WebRTC leak protection that blocks real IP exposure
Safari — Has limited WebRTC support and is generally less vulnerable
Mobile browsers on Android and iOS are also affected if they support WebRTC, including Chrome for Android and Firefox for Android.
How to Test for a WebRTC Leak
Testing for a WebRTC leak is straightforward. You can use SpeedIQ's built-in browser privacy tools to check your exposure instantly. Here is the manual process to verify your results:
Note your real IP address by disconnecting from your VPN and visiting a standard IP checker.
Connect to your VPN.
Visit a WebRTC leak test page such as SpeedIQ's privacy tool.
Compare the IPs shown. If your real IP from step 1 appears, you have a WebRTC leak.
If only your VPN's IP address appears, you are protected.
Pay close attention to both the public IP and any listed local IPs. Some tools show multiple IP addresses — what matters is whether your real ISP-assigned public IP appears anywhere in the results.
How to Fix a WebRTC Leak
Fix WebRTC Leaks in Chrome
Chrome does not provide a native option to disable WebRTC. Your best options are:
Use a browser extension: Extensions like "WebRTC Leak Prevent" or "WebRTC Control" can restrict how Chrome handles WebRTC IP exposure. Set the policy to "Disable non-proxied UDP" to force all WebRTC traffic through your VPN.
Use a VPN with WebRTC leak protection: Some VPN clients block WebRTC leaks at the application level. Check your VPN's settings for a WebRTC leak protection toggle.
Switch to Brave: Brave browser blocks WebRTC leaks natively without extensions.
Fix WebRTC Leaks in Firefox
Firefox has a built-in setting to prevent WebRTC leaks:
Type
about:configin the address bar and press Enter.Accept the risk warning.
Search for
media.peerconnection.enabled.Double-click it to set the value to
false.
This completely disables WebRTC in Firefox, which prevents leaks but also breaks WebRTC-based applications like Google Meet and Discord in that browser.
Fix WebRTC Leaks in Edge
Edge offers a built-in WebRTC privacy setting:
Go to
edge://settings/privacy.Scroll to the "Security" section.
Find "Prevent sites from detecting my real IP address using WebRTC" and enable it.
Fix WebRTC Leaks in Brave
Brave provides the strongest built-in WebRTC protection:
Go to
brave://settings/privacy.Find "WebRTC IP handling policy".
Select "Disable non-proxied UDP" for maximum protection.
Does Your VPN Protect You from WebRTC Leaks?
Not necessarily. Most VPNs route your web traffic through an encrypted tunnel, but WebRTC operates at a lower level and can bypass this tunnel. Whether your VPN protects you from WebRTC leaks depends on:
Whether the VPN client includes explicit WebRTC leak protection
Whether you are using the VPN's browser extension (which can block WebRTC at the browser level) versus only the system-level VPN client
Whether your VPN supports IPv6, or whether it blocks IPv6 when not supported
Always test after connecting to your VPN. Do not assume you are protected just because your VPN is active.
WebRTC Leaks and Anonymity
If you rely on a VPN for anonymity — whether for privacy, bypassing geo-restrictions, or security on public networks — a WebRTC leak completely undermines your protection. Your real IP address is the key piece of information that links your online activity to your physical location and identity.
Even a single page visit while your WebRTC leak is active is enough for a website to log your real IP. Advertisers, trackers, government surveillance systems, and malicious actors can all potentially capture this data.
Frequently Asked Questions
Can I disable WebRTC without breaking video calls?
Partially. Disabling WebRTC entirely (as in Firefox's about:config method) will break video conferencing in that browser. A better approach is to use a policy like "Disable non-proxied UDP" in Chrome or Brave, which blocks IP leaks while keeping WebRTC functional for most use cases.
Is a WebRTC leak the same as a DNS leak?
No. A DNS leak exposes which websites you are visiting by sending DNS queries outside your VPN tunnel. A WebRTC leak exposes your real IP address. Both are serious privacy issues, but they are different mechanisms. You can have one without the other, or both simultaneously.
Does using HTTPS protect against WebRTC leaks?
No. HTTPS encrypts the content of your connection but has no effect on WebRTC's IP gathering behavior. WebRTC leaks occur regardless of whether the site uses HTTP or HTTPS.
Are mobile apps affected by WebRTC leaks?
Native mobile apps (iOS/Android apps) are not affected because they do not use browser WebRTC APIs. The risk is in mobile browsers — particularly Chrome for Android and Firefox for Android — when visiting websites that use WebRTC.
Summary
WebRTC leaks are a silent but serious privacy threat for anyone using a VPN. They expose your real IP address through your browser without any visible warning, bypassing the encryption and anonymity your VPN provides.
The solution is to test regularly using SpeedIQ's WebRTC leak test, and to configure your browser to prevent non-proxied UDP connections. Brave offers the best built-in protection; Firefox is highly configurable; Chrome requires an extension or VPN-level fix.
Do not assume your VPN alone is protecting you. Test, verify, and take action.