What is browser fingerprinting?

It's a way to recognise a browser by combining many small, individually-harmless details — screen size, timezone, language, graphics rendering and so on. No single value identifies you, but the combination is often unique enough to follow you across sites without any cookie.

Is a fingerprint a personal ID?

No. A fingerprint is probabilistic: it says 'this browser looks like the same one we saw before', not 'this is a named person'. It can be wrong, and it changes when you update your browser, resize a window, or switch devices.

What makes me more identifiable?

Anything unusual: a rare screen resolution, custom fonts, a niche browser or version, an uncommon graphics card, certain extensions. Paradoxically, some privacy tools make you MORE unique by making your setup stand out. Blending in beats standing out.

How can I reduce my fingerprint?

Use a mainstream browser at its default window size, keep it updated, and prefer browsers that actively resist fingerprinting (Tor Browser and hardened mobile browsers do this). Avoid piling on extensions that change your signals.

Does this send my fingerprint anywhere?

No. Every signal is read and combined in your browser. The ID you see is computed locally and never leaves the page — there's no account and nothing is stored.

Identity & account privacy

Browser fingerprint checker

Sites can recognise you without cookies by combining dozens of small details your browser reveals: your screen size, timezone, fonts, graphics card and more. Together they form a fingerprint. This tool reads those signals in your browser and shows how they add up.

Reading your browser's signals…

What this means

None of the signals above identifies you on its own — plenty of people share your screen size or timezone. The risk is the combination: put fifteen common values together and the result is often unique enough to recognise your browser across sites, with no cookie involved.

It's probabilistic, not a name. A tracker is saying "this looks like the browser I saw yesterday", and it can be wrong — your fingerprint shifts when you update your browser, resize the window, or move devices.

What increases your uniqueness

A rare screen resolution or unusual browser-window size.
Custom or many installed fonts, and certain extensions.
A niche browser or an old version everyone else has updated past.
An uncommon graphics card, surfaced through the WebGL renderer string.
Ironically, some privacy add-ons — by making your setup stand out rather than blend in.

How to blend in

The goal is to look like everyone else, not to look special. Use a mainstream browser at its default window size, keep it current, and resist piling on extensions. Browsers that actively normalise their signals — Tor Browser on the desktop, hardened mobile browsers — do the heavy lifting for you.

Browser fingerprint checker — common questions

What is browser fingerprinting?: It's a way to recognise a browser by combining many small, individually-harmless details — screen size, timezone, language, graphics rendering and so on. No single value identifies you, but the combination is often unique enough to follow you across sites without any cookie.
Is a fingerprint a personal ID?: No. A fingerprint is probabilistic: it says 'this browser looks like the same one we saw before', not 'this is a named person'. It can be wrong, and it changes when you update your browser, resize a window, or switch devices.
What makes me more identifiable?: Anything unusual: a rare screen resolution, custom fonts, a niche browser or version, an uncommon graphics card, certain extensions. Paradoxically, some privacy tools make you MORE unique by making your setup stand out. Blending in beats standing out.
How can I reduce my fingerprint?: Use a mainstream browser at its default window size, keep it updated, and prefer browsers that actively resist fingerprinting (Tor Browser and hardened mobile browsers do this). Avoid piling on extensions that change your signals.
Does this send my fingerprint anywhere?: No. Every signal is read and combined in your browser. The ID you see is computed locally and never leaves the page — there's no account and nothing is stored.

Related free tools

WebRTC leak testSee whether your browser is handing out your real IP behind your VPN.Do Not Track & GPC checkerCheck whether your browser is sending Do Not Track and Global Privacy Control signals.IP, DNS & IPv6 checkerSee the public IP the internet sees, whether IPv6 is exposed, and what DNS leaks mean.

All free privacy tools

What NordSecure does about it

A free test tells you what's leaking. Fixing it usually means changing the device or the connection, not just the browser tab — which is exactly what NordSecure sells, without a name or an account.