Websites can recognize you without cookies by combining dozens of freely-readable browser characteristics into a fingerprint. This inspector shows you exactly what that surface looks like for the browser you're using right now — which signals answered, what each one returned, and an upper-bound estimate of the identifying information they carry — so you can judge your exposure and test the effect of privacy settings.
Everything runs in your browser; nothing is uploaded, logged, or stored. To dig into individual signals, the User-Agent parser breaks down the biggest one, What is my IP covers the network side, and the EXIF remover handles the metadata your photos leak.
Frequently asked questions
What is browser fingerprinting?
Fingerprinting is a tracking technique that combines many small, freely-readable browser characteristics — your user agent, screen size, timezone, fonts, GPU, how your machine renders a canvas — into a signature distinctive enough to recognize you across sites without cookies. No permission prompt is involved, which is why this page can show you everything instantly.
Does this tool send my fingerprint anywhere?
No. Every signal is read and displayed locally in your browser and the page makes no network request with any of it. The point is to show you what any site could read, not to collect it.
What does the "bits" estimate mean?
Bits of identifying information, in the sense popularized by EFF’s Panopticlick study: each bit halves the group of people who share your values. Around 33 bits would identify one person among the world’s population. The per-signal numbers here are rough published averages, not live measurements, and adding them up double-counts, because the signals overlap — your GPU, OS, and screen size largely predict one another — which is why the page labels the total an upper bound; EFF measured about 18 bits for a complete fingerprint. Read the total as a reflection of which APIs answered, not of how rare your particular values are.
How can I reduce my browser fingerprint?
Blend in rather than customize: a widely-used browser on a common OS at default settings is harder to single out. Beyond that, Firefox’s resistFingerprinting mode, Safari’s built-in protections, the Tor Browser, and reputable content blockers all reduce or coarsen the signals sites can read. Ironically, exotic privacy tweaks can make you more identifiable, not less.
Is fingerprinting legal?
It depends on where you are. Under GDPR and the ePrivacy rules in the EU, fingerprinting for tracking generally requires the same consent as cookies, and regulators have said so explicitly. Enforcement is hard precisely because fingerprinting leaves no artifact on your device — which is why browser vendors are increasingly blunting it at the engine level.