Browser fingerprint test
Sites can build a 'fingerprint' from your browser's characteristics to recognize you without cookies. Here's what yours exposes.
Your browser exposes all of this without cookies:
Approximate fingerprint hash:
…How to use the browser fingerprint test
- Open the page: your browser traits are read automatically.
- Review what's exposed and the resulting fingerprint hash.
- Harden your browser (or use Tor Browser) to reduce uniqueness.
What this means
Sites combine these traits into a "fingerprint" that can recognize you even after you clear cookies or switch to private browsing. The more unusual your combination, the more identifiable you are.
Does a VPN stop fingerprinting?
No. A VPN hides your IP address; it does nothing about these browser traits. Fingerprinting and IP hiding are separate problems: pair a VPN with an anti-fingerprinting browser (like Tor Browser or a hardened Firefox) if that's your threat model.
Code & API examples
Use this from the command line or your code.
Browser only (JS)
console.log(navigator.userAgent, screen.width + 'x' + screen.height, Intl.DateTimeFormat().resolvedOptions().timeZone);See all endpoints at /api/tools/.
Frequently asked questions
A technique that combines dozens of browser and device traits (screen size, fonts, timezone, GPU, etc.) into an identifier that can track you even with cookies cleared.
No: a VPN hides your IP, not your browser traits. Fingerprinting and IP hiding are separate problems; use anti-fingerprinting tools alongside a VPN.
Often unique enough to single you out among millions. The more distinctive your combination of fonts, extensions, screen size, and GPU, the easier you are to re-identify across sites without any cookie.
User-Agent, screen resolution, timezone, language, installed fonts, canvas and WebGL rendering, audio stack, hardware concurrency, and more. Individually common, but combined they form a near-unique signature.
Sites ask your browser to render hidden text or graphics, then hash the result. Tiny differences in your GPU, drivers, and font rendering make that image subtly unique, producing a stable identifier.
Use a browser that resists fingerprinting (Tor Browser, or Firefox with resistFingerprinting), avoid rare fonts and extensions, and don't customize the window in unusual ways. Blending in beats standing out.
Barely. Private mode clears cookies and history but reports almost the same traits, so your fingerprint stays largely the same. It stops storage-based tracking, not fingerprinting.
Yes: people on identical default devices and browsers can collide, which is exactly why anti-fingerprinting tools try to make everyone look the same. Uniqueness is what makes you trackable.
Updates to your browser, GPU drivers, fonts, or window size shift the traits. Some anti-fingerprinting tools also randomize values per session, which lowers tracking but is itself a detectable pattern.
In some ways. Cookies you can clear or block; a fingerprint is derived from your device and persists even after you wipe storage, making it harder to escape without changing how your browser behaves.
They can. Extensions that alter the page or inject elements add detectable traits, and a rare combination of extensions is itself identifying. Fewer, common extensions blend in better.
They protect different layers. A VPN hides your network identity and location from sites and your ISP; anti-fingerprinting protects your device identity. Strong privacy needs both, not one or the other.
Related tools
Want to hide your IP for real?
vpn.golf is a no-logs WireGuard VPN. Pick a hole, take the shot.
Step up to the tee for free