WebRTC leak test
A WebRTC leak happens when your browser reveals your real IP address through WebRTC even though your traffic runs through a proxy or VPN. This free test lists every IP WebRTC exposes and compares it with the IP websites see.
The test runs in your browser. It asks public STUN servers which address your connection appears from, and compares that with the IP our server sees. Nothing is stored.
How the WebRTC leak test works
- 1
Your browser gathers ICE candidates
The page opens a WebRTC connection that never connects to anyone. To prepare it, the browser lists its network addresses (host candidates). - 2
A STUN server reports your public IP
The browser asks a public STUN server which address its request came from (server-reflexive candidates). That is the IP WebRTC would share with a peer. - 3
We compare it with your HTTP IP
At the same time the page reads the IP your web requests arrive from, the one shown on What Is My IP. - 4
You get a verdict
A public WebRTC address that differs from your visible IP while a proxy is on is a leak. Hidden or matching addresses are safe.
Why WebRTC leaks matter for proxy users
Websites that score risk, such as social networks, marketplaces and ad platforms, routinely run the same WebRTC check this page does. If it returns an address that doesn't match your proxy, the session looks like someone hiding their location, and every account in that browser can be linked to your real connection.
Account linking
Location mismatch
Fingerprint detail
Wasted clean IPs
How to fix a WebRTC leak
- Use an anti-detect browser. Tools such as Multilogin replace the WebRTC address with your proxy IP in every profile, so each account shows one consistent address.
- Limit WebRTC with an extension. In Chrome and Edge, a WebRTC control extension can restrict WebRTC to the proxied connection or turn it off.
- Disable WebRTC in Firefox. Open about:config and set media.peerconnection.enabled to false.
- Proxy the whole connection. When an app or OS-level client sends all traffic, including UDP, through the proxy, STUN sees the proxy's IP.
- Re-test after every change with this page and What Is My IP.
Frequently asked questions
WebRTC lets browsers make direct audio, video and data connections. To do that, the browser discovers its own IP addresses, and any website can ask for them with a few lines of JavaScript. If the browser finds its real public IP while your traffic goes through a proxy or VPN, the site learns the address you meant to hide. That is a WebRTC leak.