Uniqueness Check
Every browser leaks a distinctive combination of signals. This page reads yours and tells you — in bits, in plain English, and with a shareable ID — how identifiable you really are.
Most modern browsers expose enough information — screen, GPU, timezone, fonts, canvas rendering, hardware — that the combined profile is unique for more than 80% of users. Above ~32 bits of combined entropy, you are typically single-out-able across the entire web without any cookies at all.
What is browser fingerprinting? — the mechanics behind the signals above.
How websites detect your device — the full three-layer detection stack.
How to protect your privacy online — concrete steps to lower your uniqueness.
Full fingerprint report — every raw signal, per-source.
It measures how identifiable your browser is based on the combination of signals it exposes — user agent, screen size, GPU, fonts, timezone, language, canvas rendering, hardware and more. Individually each value is common; combined, they form a near-unique profile called a browser fingerprint.
We estimate the Shannon entropy of each signal in bits, then combine them. Above roughly 32 combined bits, your fingerprint typically identifies you uniquely among all internet users. The score is a rough estimate — real-world uniqueness depends on how common your setup is in the wider population.
No. Every signal is read locally in your browser and displayed to you only. Nothing is sent to our servers, logged, or used to build a profile. Reload the page and the analysis starts over from scratch.
It usually is not. Incognito clears cookies and history but does not change the underlying signals — screen, GPU, timezone and hardware stay the same. Some browsers (Safari, Brave) do add small extra protections in private mode, but your fingerprint stays largely stable.
Use Tor Browser (all users share the same fingerprint), Brave (randomizes canvas and font signals), or Firefox with resistFingerprinting enabled. Disabling JavaScript kills most fingerprinting but breaks most sites. Uncommon extensions, exotic fonts and custom OS themes make you more unique, not less.
amiunique.org compares your fingerprint against their historical database of visitors. We calculate uniqueness from information theory (entropy in bits) locally, without storing or transmitting any data. The two approaches complement each other — theirs is empirical, ours is mathematical and private.
Cookies are files a site writes to your browser that you can delete. A fingerprint is derived from your device's characteristics — there is nothing to delete. That's why fingerprinting is harder to block than cookies, and why privacy laws increasingly treat it the same way.
A VPN changes your IP address and location, but leaves your browser fingerprint untouched. Sites can still recognize you across VPN sessions from the exact same browser. For real fingerprint protection, combine a VPN with an anti-fingerprinting browser.