What Is Browser Fingerprinting? (And How to Stop It)
Browser fingerprinting is a cookieless tracking technique that recognises your device from the combination of technical details your browser reveals. Unlike cookies, you can't delete it — it's recalculated every visit, even in private mode.
Updated July 2, 2026 · 6 min read
How fingerprinting works
Every browser exposes a stream of technical details so that websites can render pages correctly: your user-agent string, screen resolution, timezone, language list, installed fonts, graphics card, and more. Individually, each detail is shared by millions of people. Combined, they form a pattern that is often unique to a single device.
Two techniques make the pattern especially stable. Canvas fingerprinting asks your browser to draw text and shapes to a hidden canvas, then hashes the pixels — tiny differences in GPU, drivers, and font rendering produce a consistent value. Audio fingerprinting does the same with a silent audio signal processed by your hardware.
Why it matters
The Electronic Frontier Foundation's original Panopticlick research found the average browser carried about 18 bits of identifying information — enough to single you out among roughly 286,000 others. Modern techniques collect far more, and because the identifier is computed rather than stored, clearing cookies does nothing to stop it.
In 2024 Google dropped its prohibition on advertisers fingerprinting users, a move the UK's Information Commissioner's Office publicly criticised. Fingerprinting is becoming more common, not less, as third-party cookies are phased out.
How to reduce your fingerprint
There are two opposite strategies that actually work: blend into a crowd, or add noise so your fingerprint never repeats.
- Use the Tor Browser for sensitive browsing — it makes many users look identical.
- Use Brave, which randomises canvas, audio, and WebGL output per site.
- Enable Firefox's resist-fingerprinting (privacy.resistFingerprinting) or Enhanced Tracking Protection in Strict mode.
- Install uBlock Origin to block the third-party scripts that do most fingerprinting.
- Avoid installing unusual system-wide fonts and browser extensions, each of which makes you more unique.
Frequently asked questions
- Can browser fingerprinting track me in incognito mode?
- Yes. Incognito and private windows stop your browser from saving history and cookies locally, but they do not change the technical signals used for fingerprinting. Your screen size, fonts, GPU, and timezone are the same, so the fingerprint is the same.
- Does a VPN stop fingerprinting?
- No. A VPN changes the IP address a site sees, which hides your location and network — but fingerprinting reads your browser and device, not your IP. You need anti-fingerprinting browser measures in addition to a VPN.