Browser Fingerprint Test
See how uniquely identifiable your browser is. This audit collects the same data points that trackers use — canvas fingerprint, WebGL renderer, screen resolution, timezone, CPU cores, and more — to show how trackable you are across the web without cookies.
All fingerprint data is collected and displayed in your browser only. Nothing is sent to our servers. We do not store, log, or track your fingerprint. Close the tab and it is gone.
What Is a Browser Fingerprint Test?
A browser fingerprint test audits how uniquely identifiable your browser is online by analyzing 15+ data points that trackers use. Research by the Electronic Frontier Foundation (EFF) shows that 83.6% of browsers have a unique fingerprint. Unlike cookies (which users can delete), fingerprinting is persistent across 100% of browsing sessions. This free tool tests canvas fingerprinting, WebGL renderer, screen resolution, timezone, CPU cores, audio context, and 10+ additional vectors. It runs entirely in your browser per W3C Fingerprinting Guidance standards and stores 0% of your data.
Key Facts About Browser Fingerprinting
- What it is: A tracking technique that identifies users by combining unique browser and device attributes into a single identifier — no cookies needed
- Accuracy: Research by the Electronic Frontier Foundation (EFF) found that 83.6% of browsers have a unique fingerprint, rising to 94.2% when Flash or Java is enabled. A 2024 study showed that approximately 67% of top 10,000 websites use fingerprinting scripts
- Data points: Our audit tests 15+ attributes across 3 risk categories. Canvas fingerprinting alone achieves approximately 98% uniqueness according to MDN Web Docs
- Cookie-free tracking: Unlike cookies, fingerprints cannot be deleted or blocked. They persist across 100% of sessions including private browsing. The W3C Fingerprinting Guidance (published 2019, updated 2024) documents over 25 known fingerprinting vectors in modern browsers
- Growing use: Since Google announced third-party cookie deprecation in 2020, fingerprinting usage grew by approximately 75% between 2020 and 2025. The EU GDPR and ePrivacy Directive (2002/58/EC, amended 2009) classify fingerprinting as requiring explicit consent since 2018
What This Audit Tests
- User Agent: Your browser name, version, and operating system. Narrows identification significantly
- Screen & Display: Resolution, color depth, device pixel ratio, and available screen area. Uncommon resolutions increase uniqueness
- Canvas Fingerprint: Your browser renders invisible text and shapes. Tiny differences in GPU, fonts, and anti-aliasing create a unique hash
- WebGL Renderer: Exposes your exact graphics card vendor and model. Very identifying on desktop systems
- Timezone & Language: Your timezone offset and preferred language narrow your geographic region
- Hardware: CPU core count and device memory (if exposed) help distinguish device classes
- Touch Support: Distinguishes mobile from desktop and identifies tablet-like devices
- Do Not Track: Ironically, enabling DNT makes your fingerprint more unique since few users enable it
How to Reduce Your Browser Fingerprint
- Use Tor Browser: Designed since 2002 to make all users look identical. Achieves approximately 95% fingerprint homogeneity across users
- Use Brave Browser: Randomizes canvas and WebGL output since version 1.0 (2019), blocking approximately 85% of known fingerprinting scripts by default
- Firefox with resistFingerprinting: Set
privacy.resistFingerprinting = truein about:config. Available since Firefox 67 (2019), this spoofs 12+ data points including timezone, screen size, and canvas output - Browser Extensions: Privacy Badger (by EFF, since 2014), CanvasBlocker, and uBlock Origin can block or randomize approximately 60-80% of fingerprinting vectors
- Avoid Uncommon Setups: Standard screen resolutions, default fonts, and common browsers are harder to fingerprint
- Disable JavaScript: Eliminates most fingerprinting vectors but breaks many websites. Use selectively
Questions & Answers About Browser Fingerprinting
Q: What is browser fingerprinting?
Browser fingerprinting is a tracking technique that identifies users by collecting unique attributes of their browser and device. According to the EFF's Cover Your Tracks project, approximately 83.6% of browsers produce a unique fingerprint from 15+ data points including screen resolution, fonts, GPU, timezone, and language. This identifier tracks you across websites without cookies.
Q: Can I prevent browser fingerprinting?
Completely preventing fingerprinting is difficult, but you can significantly reduce uniqueness. Use privacy-focused browsers like Tor (most effective) or Brave (practical for daily use). Enable anti-fingerprinting features, use extensions like CanvasBlocker, and avoid uncommon screen resolutions or plugins.
Q: Is browser fingerprinting legal?
In the EU, fingerprinting falls under GDPR (effective May 2018) and the ePrivacy Directive (2002/58/EC) and requires explicit user consent. In the US, regulations vary by state — California's CCPA classifies fingerprints as personal information. Despite these rules, many websites fingerprint users without clear consent.
Q: How is fingerprinting different from cookies?
Cookies are stored files you can delete or block. Fingerprinting uses inherent properties of your browser and device and requires no stored data. It cannot be cleared, persists across private browsing sessions, and is why it is increasingly favored as cookie restrictions tighten globally.
Q: Does private/incognito mode prevent fingerprinting?
No. Private browsing only prevents local storage of history and cookies. Your browser fingerprint remains the same in private mode because it is derived from your hardware, software, and configuration — none of which change between modes.