WebRTC leaks: what they are and how browsers handle them

If you have ever read about WebRTC leaks and wondered whether your VPN is quietly giving away more than you thought, you are asking the right question. A VPN can help, but only if you know what it covers and what it does not, and the browser you use sits partly outside that picture.

In this guide we walk through what WebRTC is in plain English, how a leak may expose an IP address, how to test your own browser, and which browser and extension settings are worth checking. We link to each browser’s own documentation where it matters and to public guidance from technical and privacy organisations, as of the date we checked in October 2026, so you can check our reading. We also explain the limits of any fix, so you know what to check next.

This is a how-to checklist from our editorial desk, not a ranking of browsers or VPN providers. Browsers update often, so menu names may differ on your device. When in doubt, your browser’s own help pages are the best guide.

WebRTC leaks: what they are and how browsers handle them

WebRTC leaks are a browser privacy question rather than a VPN fault in the usual sense. The idea is that a feature built into many browsers may share network details with a website in a way that does not always follow the path your VPN sets up. Whether that happens on your device depends on your browser, its settings, your extensions and how your VPN app handles browser traffic.

That is why we suggest testing rather than assuming. A short check takes a few minutes and tells you more about your own setup than any general article can.

What WebRTC does

WebRTC stands for Web Real-Time Communication. Mozilla’s developer documentation on the WebRTC API describes it as a technology that lets web applications capture and stream audio and video and exchange data between browsers, often without an intermediary. In everyday terms, it is part of what lets you join a video call or share a screen from a browser tab without installing extra software.

To set up those direct connections, a browser and a website exchange information about how the two sides can reach each other. That information can include network addresses. For a video call, this is useful. For someone who wants a website to see only the VPN’s address, it is worth understanding.

Why this matters to VPN users

When you connect through a VPN, websites normally see the VPN server’s address rather than the one your internet provider gave you. The Electronic Frontier Foundation’s guide to choosing a VPN explains this basic idea. A WebRTC leak describes a situation where a website may learn a different address through the browser’s real-time features, even while the VPN is connected.

How a leak can expose an IP

In plain English, a leak can happen when the browser gathers possible network addresses for a direct connection and a website’s script is able to read them. Depending on the setup, that list might include a local address on your home network, the VPN’s address, or in some cases the public address your internet provider assigned.

We are describing a possibility, not a certainty. Many browsers have changed how they handle this over time, and many VPN apps describe protections for it in their own documentation. That is exactly why your own test result matters more than a general rule.

It also helps to keep the scale in perspective. An exposed address may hint at your general location or your internet provider. It does not reveal your name by itself, but combined with other details, it may make your browsing easier to connect to you. If that matters for how you use a VPN, testing is worth the few minutes it takes.

Testing in your browser

Here is a calm routine you can follow on a laptop or desktop. It works the same way on most browsers, though menu names vary.

  1. Disconnect your VPN. Open a reputable IP lookup page or a WebRTC test page and note the addresses it shows. This is your baseline.
  2. Connect your VPN and wait until the app says it is connected.
  3. Close and reopen the browser, or open a new private window, so earlier results do not carry over.
  4. Visit the same test page again and compare the addresses it shows with your baseline.
  5. If your baseline public address appears while the VPN is connected, write down which browser and which VPN server you were using.
  6. Repeat the test in a second browser if you use more than one, since each browser may behave differently.

When choosing a test page, look for one that explains what it checks and does not ask you to install anything. Some VPN providers publish their own test pages, and some independent privacy sites do too. Avoid any page that asks for personal details or pushes a download before showing results.

Reading the result

A local address, often one that looks like it belongs to a home network, may appear in results and is generally not the same as your public address. The address to look for is the public one from your baseline. If it does not appear while connected, your current setup looks consistent with what you expect. If it does appear, the settings below are the next place to look.

Browser and extension settings

Browsers handle WebRTC in different ways, and the options change between versions. Rather than listing exact menu paths that may soon be out of date, here are the kinds of settings worth looking for, and where to check.

  • Your VPN app’s own settings. Some VPN apps describe a WebRTC or leak protection option. Check the provider’s own documentation to see whether it exists, where it lives and whether it covers your browser.
  • Browser privacy settings. Some browsers offer settings that limit what network details WebRTC can share. Look in the browser’s privacy or security section, and read its help page before changing anything.
  • Advanced configuration pages. Some browsers allow WebRTC to be turned off through an advanced settings page. This may stop video calls in the browser from working, so note what you changed in case you need to undo it.
  • Privacy extensions. Some extensions offer WebRTC controls. Before installing one, check who publishes it, what permissions it asks for and whether its listing explains clearly what it does.
  • The VPN provider’s browser extension. If your provider offers one, its documentation may explain how it handles WebRTC. Keep in mind that a browser extension and a full VPN app may protect different things.

After any change, run the test again. A setting only helps if your own result changes.

A note on video calls

If you rely on browser-based video calls for work or family, turning WebRTC off completely may get in the way. In that case, it may be more practical to keep WebRTC on in one browser that you use for calls and to use a second browser, with stricter settings, for everything else. Ask yourself which trade-off fits how you actually use your devices.

WebRTC leaks on phones and tablets

Most of the conversation about WebRTC leaks focuses on desktop browsers, but the same question can apply to mobile browsers. The settings available on a phone are often more limited, and some mobile browsers do not offer the advanced pages that desktop versions do.

The routine is the same. Note your baseline address with the VPN off, connect the VPN, open a fresh private tab and run the test again. If you use more than one browser on your phone, test each one. If your VPN provider publishes mobile-specific guidance, read it before changing anything, since a full-device VPN app on a phone may handle browser traffic differently from a desktop extension.

If you find something you cannot fix from the phone’s settings, it is reasonable to contact your provider’s support team with the browser name, the app version and the test result you saw.

Limits of any fix

No browser setting or extension can promise that your address will never be exposed in every situation. Browsers update, websites change their scripts and VPN apps change their features. A clean test today is a good sign, not a permanent guarantee.

It also helps to remember what a VPN cannot change at all. If you sign in to an account, that site knows who you are regardless of your address. If you share your email or phone number with a website, it can connect your visits to you. Cookies and other tracking methods work separately from WebRTC. Our guide on what makes a VPN private covers these limits in more depth.

For these reasons, it may help to think of WebRTC settings as one item on a short privacy checklist rather than as the whole answer.

A short WebRTC leaks checklist

If you want a routine you can return to every few months or after a browser update, these steps cover the basics.

  • Note your baseline public address with the VPN off.
  • Connect the VPN and run a WebRTC test in each browser you use.
  • Check your VPN app’s documentation for any leak protection setting and confirm whether it is on.
  • Review your browser’s privacy settings and its help page on WebRTC.
  • If you change a setting, test again and keep a note of what you changed.
  • Repeat after major browser or VPN app updates.

Questions to ask your VPN provider

If your test shows something unexpected, your provider’s support team is a good next stop. These questions may help you get a clear answer.

  1. Does your app include protection against WebRTC leaks, and which browsers does it cover?
  2. Is that protection on by default, or does it need to be switched on?
  3. Does your browser extension handle WebRTC differently from the full app?
  4. Which test page do you suggest for checking it?
  5. Where in your documentation is this explained, and when was that page last updated?

Their answers will reflect how their app works today, which is more useful than any general rule we could give.

Further reading

WebRTC leaks sound technical, but checking for them is mostly a matter of running a test, reading the result calmly and adjusting one setting at a time. Test your own browser, keep a note of what you change, and check your provider’s own documentation for the protections its app offers.