Browser Fingerprint Test: Read Results & Stand Out

This guide explains how to read an EFF (Electronic Frontier Foundation) browser fingerprint test result and, more importantly, what it means when your browser “stands apart” from others. You’ll learn what the numbers and graphs mean, why a unique fingerprint matters for your privacy, and what practical steps you can take based on the results.

What You’ll Need

• A web browser (Chrome, Firefox, Safari, Edge, or similar)
• An internet connection
• About 5 minutes of time

Step-by-Step

1. Navigate to the EFF test. Open your browser and go to coveryourtracks.eff.org. This is the official Electronic Frontier Foundation tool for testing browser fingerprinting.
2. Click the big orange button. The page shows a button labeled “TEST ME”. Click it to start the fingerprinting analysis. The test will run through dozens of checks on your browser’s configuration.
3. Wait for the analysis to complete. The test typically takes 10-30 seconds. It checks your user agent, screen resolution, installed fonts, timezone, language, browser plugins, canvas rendering, WebGL, and many other attributes.
4. Look at the headline result. After the test finishes, you’ll see one of two main verdicts:
   • “Your browser fingerprint appears to be unique among the X fingerprints we have collected so far.” This means you stand apart from the crowd.
   • “Your browser fingerprint appears to be non-unique.” This means many other browsers look identical to yours in the test’s database.
5. Read the “Among X fingerprints” number. The test tells you how many fingerprints are in its database. If your fingerprint is unique, it means no other browser in that database matches yours exactly. If non-unique, it will say something like “one in 100,000 browsers” share your fingerprint.
6. Scroll down to the detailed results table. The page lists every attribute it tested, showing what value your browser reported. Review these to understand what makes you stand apart.
7. Identify the standout attributes. Look for values that seem unusual or uncommon. Common culprits for uniqueness include:
   • Installed fonts (the more fonts, the more unique)
   • Screen resolution and color depth
   • Browser plugins or extensions
   • Timezone and language settings
   • Canvas fingerprint (a hash of how your GPU renders an image)
   • Hardware concurrency (number of CPU cores)
8. Understand what “standing apart” means. A unique fingerprint means a website can track you across sessions even if you clear cookies. Your browser configuration acts as a persistent identifier. The more unique you are, the easier it is to single you out.
9. Check the “Protection” section. The test also checks if your browser blocks tracking scripts. It will show whether your browser has any built-in fingerprinting protection.
10. Run the test again with different settings. To see what changes your fingerprint, try disabling JavaScript, using private browsing, or switching browsers. Run the test again and compare results.

Common Mistakes

• Misinterpreting “unique” as “bad.” A unique fingerprint isn’t inherently dangerous, but it does make you more trackable. The test is informational, not a security score.
• Ignoring the database size. The test compares you against a limited database (often hundreds of thousands of fingerprints). Your fingerprint might be common globally but rare in the test’s sample.
• Assuming the test is 100% accurate. The EFF test is thorough but not exhaustive. New fingerprinting techniques exist that it doesn’t check.
• Thinking a VPN makes you anonymous. A VPN changes your IP address but doesn’t change your browser fingerprint. You can still be tracked.
• Clearing cookies and assuming you’re invisible. Fingerprinting works without cookies. It’s a different tracking mechanism.
• Not understanding the difference between “unique” and “tracked.” Being unique is a prerequisite for tracking, but being non-unique doesn’t guarantee you aren’t tracked through other means.

Tips

• Use a privacy-focused browser. Browsers like Firefox (with strict privacy settings) and Brave include fingerprinting protection that randomizes or blocks certain attributes.
• Disable JavaScript for unknown sites. Many fingerprinting techniques require JavaScript. Browser extensions like NoScript or uBlock Origin can block scripts.
• Limit installed fonts. Each font you install adds a unique data point. Stick to system defaults if you want to blend in.
• Keep your browser updated. Updates often change fingerprinting attributes, which can make you temporarily unique but also patch known tracking vulnerabilities.
• Use the same browser consistently. Switching between browsers creates multiple fingerprints, which can be even more distinctive than one consistent one.
• Consider a fingerprint randomization tool. Some browsers and extensions can spoof your user agent, screen size, or canvas hash.
• Run the test on multiple devices. Each device (phone, laptop, desktop) will have a different fingerprint. That’s normal.

Troubleshooting

• The test won’t load. Check your internet connection. If you have a strict firewall or ad blocker, it might block the EFF’s scripts. Try disabling your ad blocker temporarily or using a different browser.
• The test says “Error” or “Could not complete.” This can happen if your browser blocks all third-party scripts. Try enabling scripts for the EFF site, or use a fresh browser profile.
• You see a blank page after clicking TEST ME. Your browser might have JavaScript disabled. The test requires JavaScript to run. Enable it for this site.
• The results seem wrong. If your screen resolution shows an unexpected value, you might have a virtual display or scaling active. Check your display settings.
• You get different results each time you run the test. Some browsers intentionally randomize certain fingerprint attributes. This is a privacy feature, not a bug.
• The test is slow. The fingerprinting process is computationally intensive. Give it a few more seconds. If it takes over a minute, try a different browser.

Frequently Asked Questions

What exactly is a browser fingerprint?

It’s a collection of data points your browser exposes to websites—screen size, fonts, timezone, plugins, and more. Combined, these create a unique identifier that can track you.

Is a unique fingerprint always bad?

Not always. It means you’re more trackable, but it doesn’t mean you’re being tracked. It’s a risk factor, not a verdict.

Can I make my fingerprint non-unique?

It’s difficult but possible. Disabling JavaScript, using a common browser configuration, and avoiding extra fonts/plugins helps. Some browsers offer fingerprint randomization.

Does a VPN or incognito mode change my fingerprint?

Incognito mode doesn’t change your fingerprint. A VPN changes your IP but not your browser attributes. You’ll still have the same fingerprint.

Why does my fingerprint change after a browser update?

Updates often change how your browser reports its user agent, canvas rendering, or other attributes. This can make you temporarily unique until many users update.

Should I be worried if I stand apart?

It’s a privacy consideration, not an immediate danger. If you’re concerned, use privacy tools and be mindful of the sites you visit. The EFF test is a diagnostic, not a threat assessment.

Related

• Fix Samsung Galaxy Note 4 Won’t Rotate & Gyro Dead
• Recover Data from Formatted Windows 10 Hard Drive
• How to Use Water Eject on iPhone