Browser Fingerprint Test — How Unique Is Your Browser?

See how uniquely identifiable your browser is — without cookies

Last updated: April 1, 2026

Why Browser Fingerprinting Matters

Every time you visit a website, your browser shares dozens of attributes — your screen resolution, installed fonts, GPU model, timezone, language settings, and more. Individually, these data points seem harmless. Combined, they create a fingerprint that's often unique to your device.

Unlike cookies, browser fingerprints can't be deleted, blocked, or reset. They persist across incognito sessions, survive cache clears, and can even track you across different browsers on the same machine. This makes fingerprinting one of the most persistent and difficult-to-prevent tracking methods available.

Advertising networks, data brokers, and analytics companies use fingerprinting to identify returning visitors without relying on cookies or login sessions. Even if you use a VPN to mask your IP address, your fingerprint can still uniquely identify you — defeating much of the privacy benefit.

The best defenses against fingerprinting include using the Tor Browser (which standardizes browser attributes), enabling Firefox's Enhanced Tracking Protection in strict mode, or using browser extensions that randomize fingerprint-able attributes. Understanding what your browser reveals is the essential first step.

Your Browser Fingerprint Is Just One Piece

Fingerprinting is one of several ways websites can identify and track you. Your IP address, DNS queries, and WebRTC connections all contribute to your digital profile. Test everything to understand your true exposure.

IP Lookup — See your public IP address, ISP, and approximate location as they appear to every website you visit.

DNS Leak Test — Check if your DNS queries are leaking outside your VPN, exposing the websites you visit to your ISP.

WebRTC Leak Test — Detect whether WebRTC is revealing your real IP address, even while connected to a VPN.

Speed Test — Measure your connection speed to check how VPN encryption affects your bandwidth and latency.

Frequently Asked Questions

What is browser fingerprinting?

Browser fingerprinting is a tracking technique that identifies your device by collecting dozens of attributes from your browser — including screen resolution, installed fonts, GPU model, timezone, language settings, and more. These attributes are combined into a unique identifier that works without cookies and persists across private browsing sessions.

Can I prevent websites from fingerprinting my browser?

Completely preventing fingerprinting is extremely difficult because the attributes collected are needed for normal web functionality. However, you can reduce your fingerprint uniqueness by using the Tor Browser (which standardizes attributes), enabling Firefox's strict tracking protection, or using extensions that randomize fingerprintable values.

Is browser fingerprinting legal?

In most jurisdictions, browser fingerprinting exists in a legal gray area. Under GDPR, fingerprinting for tracking purposes requires user consent, similar to cookies. However, enforcement is inconsistent and many websites fingerprint without disclosure. Some privacy laws (like CCPA) classify fingerprints as personal information but enforcement remains limited.

What's the difference between cookies and browser fingerprinting?

Cookies are small files stored in your browser that can be deleted, blocked, or expire. Browser fingerprints are calculated from your device's attributes and can't be "deleted" — they exist as long as your hardware and software configuration remains the same. Fingerprinting works even in incognito mode and across browser sessions.

Does using a VPN protect against browser fingerprinting?

A VPN only changes your IP address — it doesn't affect your browser fingerprint at all. Your screen resolution, fonts, GPU, and other attributes remain the same whether or not you're connected to a VPN. For complete privacy, you need to address both your IP address (with a VPN) and your fingerprint (with browser hardening or the Tor Browser).

All analysis runs locally in your browser. No data is sent to any server.

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