Browser Leaks: 7 Ways to Protect Your Privacy Online
You may have heard the term “browser leaks” without really knowing what they are or why you should care–this article aims to change that. Today, we share seven essential tips on how to protect yourself from browser leaks, educate you on why it’s important to do so, plus recommend a few excellent VPNs to help shore up your security online.
Online privacy is a much larger concern than it used to be. With surveillance efforts, spying ISPs, and cyber criminals lurking around every corner, it’s practically impossible to be too paranoid these days. That’s why understanding browser leak dangers and VPN vulnerabilities is so important if you want to be prepared.
There are a lot of things that go into the browser leaks category. Private data, personal information, identifying facts such as which browser you use or where you’re located. There isn’t one single fix for all of these problems. Instead, there are multiple things you need to do to lock down your browsing privacy and protect your IP address.
The following VPNs have a great track record of shoring up browser security:
- NordVPN – Best for Browser Security – Whether you opt for the browser extension or standalone VPN app, NordVPN delivers the best overall security currently available. Spoof into thousands of servers strewn across the world, protected by unbreakable NordLynx encryption, DNS leak protection, and a kill switch.
- Surfshark – An affordable provider with top-shelf privacy provisions–all of which are available on their browser extensions.
- ExpressVPN – One of the best choices for lag-free, hyper-secure browsing. Now even better with the launch of Lightway encryption.
- CyberGhost – Simply select “browse anonymously” and let your VPN handle the advanced configuration for you.
- PrivateVPN – A strong choice for technically-minded users who love to tweak encryption settings for optimal performance.
- PureVPN – An incredibly powerful spoofer, with servers in over 140 countries.
We’ve collected a list of seven things to do about browser leaks, everything from utilizing a good VPN to changing to a more secure browser and installing the best browser extensions. Read on!
First, get a reliable VPN to stop browser leaks
A reliable virtual private network (VPN) offers a ton of benefits, extending far beyond fixing certain leaks and keeping your data secure. You can hide your identity easily with a VPN, all thanks to strong data encryption. You can also switch virtual locations for Colombian location spoofing and bypass censorship firewalls with ease, all without lifting a finger.
Choosing the right VPN isn’t as easy as you might think, however. There’s a lot of data to sift through and compare. In general, look for a service that offers DNS leak protection and automatic kill switches, has fast VPN servers, offers lightweight apps, and runs a strict zero-logging policy—a hallmark of the best no-log providers—in as many areas as possible.
We did the research and found the top VPNs on the market that can help keep you safe from browser leaks. The results are listed below.
1. NordVPN
NordVPN is the world’s most reliable VPN. The company runs an impressively large network of over 5,800 servers in 59 countries, which means you can sign up and stream Netflix from just about anywhere in the world. All servers are available without a single limitation on speed or bandwidth, and you can also access unique features like double encryption, protection from DDoS attacks, and onion routing over VPN with a single click.
NordVPN’s lightweight software comes with everything you need to stay safe on PC, Mac, Linux, iOS, Android, Fire TV, and more. You also get 256-bit AES encryption, DNS leak protection, an automatic kill switch, and a zero-logging policy that covers time stamps, DNS requests, IP addresses, and traffic when you join. It’s extremely easy to set up NordVPN and use on your favorite device.
Read our full NordVPN review.
- Works with Netflix, BBC iPlayer without breaking a sweat
- Over 5,400 servers in 61 countries
- Connect up to 6 devices at once
- Strict zero logs policy on both traffic and metadata
- Live Chat Support.
- Some servers can be unreliable
- They can take 30 days to process refunds.
2. Surfshark
Surfshark is not only one of the best VPNs, it also offers some of the top Firefox and Chrome browser extensions. Unlike many other providers, Surfshark leaves nothing out of their browser extensions, and that includes protection against IP, DNS, and even WebRTC browser leaks.
Their built-in smart DNS is not only leakproof, but also makes it so you can easily sneak past Netflix’s VPN ban. Combined with 256-AES-GCM encryption plus blanket obfuscation on every one of their 3200+ servers in 65 countries, and you have a potent solution for unblocking content around the world.
We also love Surfshark’s kill switch, split tunneling, individually configurable Wi-Fi network settings, zero logging policy, and blazing fast speeds. But perhaps the most compelling reason to go for this scrappy young (launched in 2019) VPN is the price–it’s super cheap, and can be had for even less thanks to its policy of allowing unlimited simultaneous connections (shared among friends, of course!).
- Reliably unblocks Netflix US, UK, Japan, and more
- Server selection is dead simple and quick
- Accepts cryptocurrency payments for enhanced anonymity
- Independently audited privacy practices
- Helpful 24/7 live chat with an actual human being.
- Connection speeds won't impress users of other high-end VPNs
- Apps may be too simplistic for power users.
Read our full Surfshark review.
3. ExpressVPN
ExpressVPN is one of the fastest VPNs you can use. It offers incredibly useful privacy options on each of its apps, supporting PC, Mac, Linux, Android, iOS, and many other platforms. This gives you the ability to quickly unblock Netflix and change countries no matter where you prefer to stream. ExpressVPN makes it easy with a simple one-click interface and lightweight app design.
Data sent through ExpressVPN’s network is secured with strong 256-bit AES encryption and backed by a zero-logging policy on traffic, DNS requests, and IP addresses. Information stays secure thanks to an automatic kill switch and DNS leak prevention features on the app, as well. All of these work with ExpressVPN’s network of over 3,000 servers in 94 different countries to give you a fast and secure connection anywhere in the world.
Read our full ExpressVPN review.
- Unblocks US Netflix, BBC iPlayer, Hulu and Amazon Prime
- 3,000+ super fast servers
- Supports ALL devices
- No personal information logs kept
- 24/7 Chat Support.
- Month-to-month plan has high cost.
4. CyberGhost
CyberGhost delivers an all-around amazing VPN experience for anyone who wants to keep their data secure online. The company’s lightweight apps run on nearly every device imaginable, including Android, iPhone, iPad, Mac, Linux, and PC, all of which help prevent browser leaks and accidental identity reveals.
As soon as you join CyberGhost you’ll have full access to the company’s large network of over 6,000 servers in 87 countries, all with unlimited data, full privacy protections, and no restrictions on speed. CyberGhost keeps its users safe with 256-bit AES encryption on all data, a zero-logging policy on traffic, time stamps, and IP addresses, and both DNS leak protection and an automatic kill switch. These features hide your identity whenever you go online, allowing you to connect with full encryption and an anonymous IP address no matter where you go.
Read our full CyberGhost review.
- SPECIAL OFFER: 79%OFF
- Special profile designed for torrenting privately
- Apps for ALL devices
- Private: Strong no logs policy
- 45-days money back guarantee.
- Can’t unblock some popular streaming sites.
5. PrivateVPN
PrivateVPN is a strong, fast, secure, and safe VPN that makes it easy to lock down your data with top-tier protection. The company offers some of the best software packages in the industry, all designed with speed and ease of use and mind, and the apps come with some amazing customizable security features, as well. With PrivateVPN you can surf and stream from around the world in complete privacy at the touch of a button.
PrivateVPN operates a small but strong network of 150 servers in 59 different countries. Data is locked down with 256-bit AES encryption to keep your connection safe, and an automatic kill switch and DNS leak protection prevent identity reveals. PrivateVPN also delivers a zero logging policy on all traffic ensure your privacy is never at risk.
Read our full PrivateVPN review.
6. PureVPN
PureVPN isn’t just a VPN service, it’s a full security suite. The company packs an entire selection of online privacy features into its software, allowing you to protect your devices with one-click anti-virus scans, malware shields, app blocking features, and built-in website filters. No other VPN gives you this much protection, and few services make it this easy to stay safe from so many threats. PureVPN is easily one of the most comprehensive online safety services around.
On the privacy side of things, PureVPN keeps data secure with a zero-logging policy on traffic, an automatic kill switch, military-grade 256-bit AES encryption on all data, and DNS leak protection. These features work together to keep your data secure no matter where you access the internet from. And with PureVPN’s fast self-owned network of over 2,000 servers in 140 different countries, you’ll be spoiled for choice when configuring your VPN connection.
Read our full PureVPN review.
Next, fix these five types of browser leaks
Not sure what part of your browser is leaking, or if there are any browser leaks at all? Run a quick test on doileak.com or Panopticlick, then evaluate the results and use the fixes below to stay safe.
1. IP address leaks
IP address leaks can happen in more ways than most people realize. While a VPN is designed to replace your real IP address with a server IP, exposure can still occur through WebRTC (which can reveal your local and public IP even inside a VPN tunnel), IPv6 addresses bypassing an IPv4-only VPN, DNS mismatches that point back to your ISP, proxy misconfiguration, or a VPN app that crashes or fails to establish its tunnel properly. Limiting your concern to browser extensions alone means you are likely missing the most common leak paths.
To run a proper check, follow this workflow:
- Before connecting to anything, note your normal public IP address by visiting a site like BrowserLeaks.com.
- Connect using your VPN’s full desktop or mobile app, not just the browser extension.
- Run the IP, WebRTC, DNS, and IPv6 tests available on BrowserLeaks.com.
- A clean result means only your VPN’s exit IP appears—no home or public IP, no local IP candidate from WebRTC, no ISP-owned DNS resolver, and no home IPv6 address.
If any of those checks surface your real information, you have a leak that needs fixing. Start by enabling your VPN’s built-in DNS leak protection and kill switch, then re-test. If the leak persists, switch from the browser extension to the full VPN app, disable IPv6 at the OS or router level if your VPN does not support it natively, and reconnect on a different server or protocol before testing again.
2. Memory leaks
Memory leaks occur when a browser or browser add-on starts hogging your system’s memory thanks to poor programming practices. Essentially, memory allocated from your device to run the browser is used by the program. When it’s done with the section of memory, it’s supposed to return it to the operating system. This doesn’t always happen, though, resulting in a much larger memory usage footprint.
Fixing a memory leak requires locating the source of the leak itself. There are several main areas where a leak can occur, including web pages themselves, the browser engine, and certain add-ons. The only way to fix the first is to not use the web page causing the leak. The second requires switching browsers. The third simply involves uninstalling the add-on.
Browser memory leaks are frustrating, but unfortunately there’s little you can do about them. It’s up to the programmers to detect and patch these issues before they arise.
3. JavaScript leaks
One of the most common types of browser leaks are JavaScript-related. JavaScript is a garbage collecting programming language that helps developers manage memory by checking which pieces of memory are still available, then comparing that to the memory required for the browser application. JavaScript memory leaks occur when poor programming practices use up too much memory and the program doesn’t automatically take care of this.
Just as the case with memory leaks above, there’s no way for the end-user to fix the issue apart from not using the JavaScript in question. Uninstalling add-ons, utilizing new websites, or switching browsers is the way to go.
4. Browser privacy leaks
This is a big category of browser leaks, but arguably the most important. Browsers transmit a ton of information from our devices. They hold passwords, e-mail content, visited websites, movie streams, and other habits you may want to keep private, especially if you need to hide Pornhub activity. Websites interfacing with your browser must learn a little bit about you before they can share data. In the case of browser leaks or malicious website scripts, your system shares a little too much information.
Plugging up privacy leaks is a simple matter of protecting yourself with the right software and add-ons along with smart browsing practices. To get started, we recommend using Firefox or Brave, two browsers that put your online privacy at a premium. Next, look into the extensions listed below, all of which lock down your data to prevent information leaks.
- uBlock Origin – There are tons of trusted free adblockers around, but the only one that maintains top-level trust is uBlock Origin, as it’s fully open source and protects from more than just malicious ads. Make sure you install uBlock Origin, not uBlock.
- HTTPS browser protections – The EFF retired HTTPS Everywhere because HTTPS is now broadly built into modern browsers. Instead of installing that extension, enable HTTPS-Only Mode in Firefox (Settings > Privacy & Security > HTTPS-Only Mode) or Always Use Secure Connections in Chromium-based browsers (Settings > Privacy and Security > Security). These native settings accomplish the same goal without needing an add-on.
- NoScript – A script- and tracker-blocker designed to prevent browser fingerprinting and click hijacking tactics.
- Privacy Badger – Another extension made by the EFF designed to protect your online privacy. Simply put, Privacy Badger automatically learns to block invisible trackers that attempt to steal your data.
5. WebRTC leaks
WebRTC stands for Web Real-Time Communication, a free and open source project launched in 2011 that provides web browsers with a simple interface for exchanging audio and video communications without installing additional plugins. WebRTC browser leaks are often associated with VPNs, but the reality is they are straight-up browser vulnerabilities.
WebRTC leaks present a potential weak spot for cyber criminals to exploit. Any website receiving requests from your browser, even encrypted and anonymous requests, could theoretically run certain commands to determine your real IP.
You can test for WebRTC leaks by visiting ipleak.net, waiting for it to run a standard IP address test, then looking at the section that says Your IP addresses – WebRTC detection. If a leak is shown, you should look into repairing it right away.
It’s easy to fix this type of browser leak. All you have to do is visit your configuration page or install a certain add-on and you’re safe. Learn more about WebRTC leaks before you do that, or jump straight to our featured article about fixing WebRTC leaks for Chrome, Firefox, Opera, and Yandex.
DNS and IPv6 leaks: how to diagnose and fix them
DNS and IPv6 leaks are among the most frequently overlooked privacy problems, yet they are often the ones that silently expose your identity even when your VPN appears to be working correctly.
What is a DNS leak?
Every time you visit a website, your browser sends a DNS query to translate a domain name into an IP address. If those queries travel outside your VPN tunnel and reach your ISP’s resolvers instead of your VPN provider’s servers, your ISP can see every site you visit—even though your traffic is technically encrypted. This is a DNS leak.
How to run a DNS leak test
Visit BrowserLeaks.com and run the DNS leak test while connected to your VPN. The results will list the DNS resolvers your browser is using. Compare those against your VPN provider’s published resolver ranges. If you see resolvers registered to your home ISP rather than your VPN provider, you have a DNS leak.
How to recognize a problem
- ISP-owned resolvers appearing in the results are the clearest sign of a DNS leak.
- A mismatched country between your detected IP and your DNS resolver location is also a red flag.
- Any home IPv6 address showing up means your IPv6 traffic is bypassing the VPN tunnel entirely, which is a separate but equally serious exposure.
How IPv6 can bypass your VPN
Most consumer VPNs route IPv4 traffic through the encrypted tunnel but leave IPv6 traffic unprotected. If your ISP has assigned you an IPv6 address and your VPN does not explicitly handle IPv6, websites that support IPv6 will see your real address. A clean result means no home IPv6 address appears anywhere in your test results.
How to fix DNS and IPv6 leaks: try these steps in order
- Enable your VPN’s built-in DNS leak protection setting if it has one—most reputable apps include this.
- Switch from the browser extension to the full VPN desktop or mobile app, which routes all system traffic rather than just browser traffic.
- If your VPN does not support IPv6, disable IPv6 at the operating system or router level.
- Flush your DNS cache (on Windows:
ipconfig /flushdns; on macOS:sudo dscacheutil -flushcache) and reconnect. - Reconnect using a different VPN protocol or server and re-test.
A clean result after these steps should show only VPN-provided resolvers in the DNS test and no home IPv6 address in the IPv6 test.
How to check for browser fingerprinting leaks
Not every browser leak involves your IP address. A large category of privacy exposure falls under browser fingerprinting—the practice of collecting small pieces of technical data from your browser and combining them into a profile unique enough to track you across sessions, even if you change your IP or clear your cookies. A VPN alone does not fix fingerprinting leaks.
Canvas fingerprinting
When a website instructs your browser to draw an invisible image using the HTML Canvas element, the output varies slightly depending on your graphics hardware, drivers, and operating system. That variation produces a hash that can be stable enough to identify your device across visits. Test your canvas fingerprint at BrowserLeaks.com/canvas. A risky result is a unique, consistent hash that never changes between sessions. The practical fix is to use a browser with canvas randomization built in, such as Brave, or to install an extension like Canvas Blocker that introduces controlled noise into the output.
WebGL and GPU data
WebGL tests go a step further than canvas by exposing your GPU vendor and renderer strings—for example, identifying your graphics card model or revealing that you are running inside a virtual machine. Visit BrowserLeaks.com/webgl to see what your browser reports. A risky result is a specific GPU string that narrows down your hardware. Brave blocks this by default; in other browsers, disabling WebGL in settings or using a spoofing extension reduces the exposure.
Font detection
Websites can probe which fonts are installed on your system by measuring how text renders in different typefaces. The combination of fonts available on your device can be highly unique, especially if you have installed software that bundles custom fonts. Check your font fingerprint at BrowserLeaks.com/fonts. A long, unusual list of detected fonts increases your uniqueness score. Reducing installed fonts or using a browser that limits font enumeration helps here.
AudioContext fingerprinting
Similar to canvas fingerprinting, audio fingerprinting uses the Web Audio API to process a short sound signal. The tiny variations in how your hardware and software handle audio processing produce a unique value. You can test this at BrowserLeaks.com. The fix is the same as for canvas—use Brave or a browser extension that randomizes audio output.
HTTP headers and Client Hints
Every request your browser makes includes HTTP headers that describe your browser version, operating system, accepted languages, and more. Newer Chromium-based browsers also send User-Agent Client Hints, which can reveal detailed device information to any site that asks. You can inspect what your browser is sending at BrowserLeaks.com/http. A risky result is a header set that uniquely describes your exact OS version, browser version, and language combination. Switching to Firefox (which has more conservative Client Hints support) or using a user-agent spoofing extension reduces this surface.
TLS and JA3 fingerprints
Even before a single byte of browsing data is exchanged, your browser performs a TLS handshake. The specific combination of cipher suites, TLS extensions, and elliptic curves your browser advertises during that handshake produces a JA3 fingerprint that can identify your browser type regardless of what IP you are connecting from. This means a VPN does not hide your TLS fingerprint. You can check yours at BrowserLeaks.com/tls. Mitigation options are limited for most users, but using the Tor Browser—which normalizes TLS parameters—is the most effective solution if this level of anonymity is required.
Geolocation and browser permissions
If your browser has been granted geolocation permission by any site, it can share your precise physical location independent of your IP address. A mismatched combination—for example, a VPN exit IP in the Netherlands but a timezone set to US Eastern and a browser language of en-US—is itself a fingerprinting signal that tells trackers your VPN is active and hints at your real region. Review your browser’s site permissions regularly and revoke geolocation access for any site that does not strictly need it. Also make sure your browser timezone and language settings are consistent with your chosen VPN location when privacy matters most.
Finally, change to a more secure browser to prevent browser leaks
One of the best things you can do for your core security is to use a browser that puts your privacy first. Microsoft Edge, Safari, and Chrome might be popular, but they aren’t necessarily the top choices when it comes to staying safe online. For comprehensive Chrome VPN browser protection, you’ll want to pair your browser with a reliable VPN service. If you need additional anonymity, you can also consider using a proxy web browser to mask your IP address while surfing. For students and educators looking to maintain privacy in restricted environments, implementing proxy privacy for school can be an effective solution.
Firefox
Firefox has long been the browser of choice for anyone interested in protecting their online privacy. Part of this has to do with the browser’s open-source nature, which allows anyone to take a peek at the code to make sure everything is as air tight as it’s supposed to be. Another factor is the browser’s many privacy-oriented extensions built to prevent browser leaks, data exposure, and attacks of all types.
Beyond the browser itself, Firefox is maintained by Mozilla, a team that actively fights for digital privacy causes. Chrome is made by Google, a company that is known to collect and use personal data. With Firefox, there’s no impetus to violate your rights, giving the browser a strong privacy slant from the ground up.
Firefox is the best all-purpose browsing solution for anyone interested in a fast, safe, and secure web experience. Download Firefox for your favorite device and get started today.
Brave Browser
Brave is an open-source browser project launched by the original co-founder of Mozilla. Its purpose is to deliver a secure web experience without sacrificing usability. If you’re looking for a privacy-focused Chromium setup, it’s loosely based on the Chromium engine, which powers Google’s Chrome browser, but it comes with a number of added privacy features that make everyday web use more secure, no extensions required.
Apart from its built-in ad blocking feature, Brave also delivers phishing and malware protection, script blocking, browser fingerprinting protection, and HTTPS Everywhere, all built into the browser itself, no add-ons required. Everything can be configured to your liking through the orange shield button, but for the most part, you can download Brave and start enjoying a better internet experience right away.
Tor Browser
When it comes to raw security and privacy, nothing can beat the Tor Browser. The software is built upon a Mozilla core that leverages onion routing to encrypt and redirect every packet of data that leaves your device. Data is passed through a series of nodes that send packets back and forth to obfuscate the origin, making it practically impossible for anyone to tell where a packet came from.
This means everything you do in the Tor Browser is about as anonymous as you can get. Browser leaks are practically impossible since every part of the browser is built to keep you safe.
READ ALSO: Check out these legal deep web sites with Tor
The Tor Browser comes with a host of default security features that eliminate possible breaches of identity. Technologies like Flash, Java, or embedded applets are disabled by default, since they can potentially cause information leaks. This means you won’t be able to do things like watch videos or play games in your browser, but it also means that browser leaks are a thing of the past.
Learn more about the Tor Browser experience in our complete guide on how to use Tor.
Conclusion
Browser leaks are frustrating, but there are plenty of tools you can use to stay safe online. Whether it’s choosing a better, safer browser, installing the right add-ons, or simply digging in and patching the leak yourself, the power of online privacy is in your hands.
Want to share your favorite tips for fixing browser leaks? Share your thoughts in the comments section below!
If you need a VPN for a short while when traveling for example, you can get our top ranked VPN free of charge. NordVPN includes a 30-day money-back guarantee. You will need to pay for the subscription, that’s a fact, but it allows full access for 30 days and then you cancel for a full refund. Their no-questions-asked cancellation policy lives up to its name.
