Browser Leak Test

Discover what personal information your browser is revealing to websites. Test for tracking, fingerprinting, and privacy leaks instantly.

Your Privacy Score
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Run test to see your privacy score
Click "Run Privacy Test" to analyze your browser's privacy settings

Quick Privacy Tips

  • Use browser extensions like uBlock Origin or Privacy Badger
  • Regularly clear cookies and browsing data
  • Consider using privacy-focused browsers (Firefox, Brave)
  • Use private/incognito mode for sensitive browsing
Privacy Recommendations
  • Use Privacy-Focused Browsers
    Consider switching to browsers with strong privacy protections like Firefox, Brave, or Tor Browser. These browsers block trackers by default and offer enhanced privacy features.
  • Install Privacy Extensions
    Use browser extensions like uBlock Origin (ad blocker), Privacy Badger (tracker blocker), and HTTPS Everywhere. These tools significantly reduce tracking and fingerprinting.
  • Manage Cookies & Site Data
    Regularly clear cookies and site data, or use your browser's private/incognito mode. Consider blocking third-party cookies in your browser settings.

Browser Leak Test: Uncover What Your Browser Reveals About Your Privacy

In today's digital ecosystem, every click you make can be tracked, analyzed, and used to build a profile about you. Our comprehensive and completely free browser leak test is designed to empower you with knowledge. This essential privacy test reveals the hidden data trails your browser leaves behind—information that advertisers, trackers, and even malicious actors can use for browser fingerprinting, targeted advertising, and invasive tracking. Understanding these leaks is the first critical step toward reclaiming your online privacy and enhancing your browser security.

What is Browser Fingerprinting and Why Should You Care?

Browser fingerprinting is an advanced, often invisible, tracking methodology that goes far beyond simple cookies. Imagine your browser as a complex machine with hundreds of unique settings—your installed fonts, screen resolution, operating system version, language preferences, time zone, active plugins, and even your graphics card details. Fingerprinting scripts on websites silently collect dozens of these data points to weave together a unique digital signature for your device. This "fingerprint" is remarkably persistent. Unlike cookies that you can delete, your fingerprint remains largely stable because it's based on configurations most users rarely change. This makes it a powerful tool for cross-site tracking, even when you're using private browsing modes or regularly clearing your history.

The Extent of Data Collection: What Can Websites See?

When you perform an online privacy check with our tool, you might be shocked by the breadth of information accessible. Modern browsers are designed for functionality and personalization, which unfortunately creates numerous data points that can be harvested:

How Our Free Browser Leak Detector Works

Our tool acts as a privacy leak detector that runs entirely within your browser. No personal data is sent to our servers—every test executes locally on your machine. We simulate the same data collection methods that real-world websites use, providing you with a transparent, real-time report. You'll see exactly what a visiting website could learn about you, presented alongside a clear privacy score. This score helps you instantly gauge your vulnerability: a high score indicates strong privacy, while a low score signals that your browser is revealing too much identifiable information.

Comprehensive Tests Performed in Our Browser Security Scan

Our browser security test suite is meticulously designed to check all major avenues of data exposure:

Performing this web tracking test is not about causing fear, but about fostering awareness. By knowing what your browser reveals, you can take informed steps to protect yourself. The detailed results and personalized recommendations guide you toward practical actions, such as installing specific privacy extensions, adjusting browser settings, or considering more privacy-focused browsers. In an era of pervasive tracking, knowledge isn't just power—it's your primary defense for maintaining online anonymity and security.

Frequently Asked Questions About Browser Privacy Testing

Is running this browser leak test safe?

Absolutely. Our privacy test operates 100% client-side within your browser tab. We do not collect, store, or transmit your results to any server. The tool simply shows you the information that any website you visit has the technical capability to access. It's a safe, educational mirror held up to your own browser.

What's the real difference between cookies and browser fingerprinting?

Think of cookies as a nametag you can choose to wear or remove. Fingerprinting is like measuring the exact length of your arms, fingers, analyzing your gait, and voice tone to identify you, even without a nametag. Cookies are files stored on your device that you can delete. Fingerprinting creates a unique profile based on the unchanging or semi-permanent characteristics of your browser and device setup, making it a much stealthier and persistent form of tracking.

How can I improve my browser's privacy score after the test?

Improving your score is very achievable. Start by switching to or using the strict privacy modes in browsers like Firefox (with Enhanced Tracking Protection) or Brave. Install essential privacy extensions: uBlock Origin for blocking ads/trackers, Privacy Badger to learn and block new trackers, and CanvasBlocker to spoof fingerprinting data. Disable unused plugins, always use a reputable VPN to mask your IP, and consider using a browser's built-in "resist fingerprinting" feature if available.

Can you explain canvas fingerprinting in simple terms?

Imagine every computer's paintbrush (the graphics processor) has microscopic, unique imperfections. Canvas fingerprinting works by asking your browser to "paint" a hidden, complex image using HTML5's Canvas element. The exact way the pixels are rendered—influenced by your OS, graphics driver, and hardware—creates a nearly unique image data output. This output string acts as a powerful identifier, much like a real fingerprint.

Do websites know my exact home address from my browser?

No, a standard browser leak test or website cannot deduce your exact street address. However, they can obtain your approximate location (typically city or region level) from your IP address. If you grant permission to a website to access your device's GPS (common on mobile devices), then yes, it can get very precise coordinates. Our tool shows what location data is available without any permission prompts.

Is the "Do Not Track" setting effective?

The "Do Not Track" (DNT) setting is more of a polite request than an enforceable technical barrier. When enabled, your browser sends a header asking websites not to track you. However, compliance is entirely voluntary. Most major advertisers and trackers simply ignore this signal. While it's good to enable as a statement of your preference, you should not rely on it for meaningful privacy protection. Real protection comes from actively blocking trackers with extensions and privacy-focused browser settings.

What is a WebRTC leak and how does this test check for it?

WebRTC is a technology for real-time communication (like video calls) in the browser. A WebRTC leak can occur when these protocols inadvertently reveal your local or public IP address, even when you're using a VPN that's supposed to hide it. Our test probes the WebRTC API to see if such identifying network information is accessible to webpage scripts, which is a critical check for VPN users.

Will using private/incognito mode prevent fingerprinting?

No, not really. Private browsing modes primarily prevent storing local history, cookies, and form data after the session closes. They do little to mask the core technical attributes used for browser fingerprinting—your screen size, fonts, installed plugins, etc., remain visible. For true fingerprinting resistance, you need specialized browser settings or extensions designed to normalize or spoof these data points.

How often should I run a browser privacy check?

We recommend running a privacy test whenever you make significant changes to your browser setup—after installing new extensions, updating your browser or OS, or changing major security settings. Running it quarterly is also a good habit to ensure your privacy posture hasn't degraded over time due to updates or new tracking techniques.

Does this tool work on all browsers and devices?

Yes, our browser leak test is designed to work on all modern desktop and mobile browsers, including Chrome, Firefox, Safari, Edge, and Brave. The results will vary based on each browser's inherent privacy protections and your specific configuration, giving you an accurate picture of your privacy on that particular device and browser combination.