What is a browser fingerprint?
A browser fingerprint is the combination of small details your browser reveals — enough, together, to recognise you across sites without any cookie.
What it is
On its own, each signal is harmless: your screen size, time zone, language, installed fonts, graphics card (via WebGL), and how your device draws hidden images (canvas/audio hashes).
Combined, these form a profile that is often unique — a fingerprint that identifies your browser even after you clear cookies or use incognito.
Why it matters
Fingerprinting lets advertisers and trackers follow you across websites and rebuild your identity after you wipe cookies. It works in private mode and is hard to notice, which is exactly why it's used.
How to check
Open the tool above. It computes the same signals a tracker would — canvas, audio, WebGL, fonts, time zone — and shows how distinctive your browser looks, plus the privacy signals (Do Not Track, GPC) you send.
How to fix
You can't be invisible, but you can blend in:
- Use a privacy-focused browser (e.g. Tor Browser, or Firefox with resist-fingerprinting) that makes many users look alike.
- Avoid niche extensions and exotic fonts that make you stand out.
- Keep your browser updated so you match the crowd.