Browser Fingerprinting Explained: How Websites Track You Without Cookies
Browser Fingerprinting Explained: How Websites Track You Without Cookies
What Is Browser Fingerprinting?
Browser fingerprinting is a method of tracking users online without using cookies. Instead of storing an identifier on your device, it identifies you by collecting a combination of technical characteristics from your browser and device — your "fingerprint." This fingerprint is then used to recognize you across websites and over time, even if you clear your cookies, use private browsing mode, or change your IP address.
Every time your browser loads a page, it shares dozens of pieces of information: your browser version, operating system, screen resolution, installed fonts, timezone, language settings, graphics hardware, and much more. Individually, these attributes are common. Combined into a single profile, they become statistically unique — different enough from other browsers to identify you with high accuracy.
A 2010 study by the Electronic Frontier Foundation found that 84% of browsers had a unique fingerprint. By 2016, that number had risen to over 99%. Modern fingerprinting techniques are even more precise.
What Data Is Collected for Fingerprinting
- Browser name and version
- Operating system and version
- Screen resolution and color depth
- Canvas fingerprint — see our canvas fingerprint test
- WebGL fingerprint — see our WebGL fingerprint test
- Audio fingerprint — see our audio fingerprint test
- Installed fonts — see our font fingerprint test
- TLS fingerprint — see our TLS fingerprint explained
- HTTP headers — see our HTTP headers guide
How to Reduce Your Browser Fingerprint
Use Brave Browser
Brave has the most comprehensive built-in fingerprint protection of any major browser. It randomizes canvas, WebGL, and audio fingerprints, making them different on each page load.
Use Firefox with Privacy Hardening
Enable "Resist Fingerprinting" in about:config: set privacy.resistFingerprinting to true.
Use the Tor Browser
The Tor Browser applies the strongest fingerprint resistance available, making all users appear identical.
Summary
Browser fingerprinting is an invisible, persistent tracking technique that follows you across the web without cookies, without your consent, and without any indication that it is happening. Use SpeedIQ's browser fingerprint tests to see exactly what data your browser is exposing right now.
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