Browser Fingerprint Test Explained: What Our Scan Checks

Our fingerprint test is free. It shows what a site can learn about your browser, and where your profile contradicts itself. This page lists what it collects and how it scores.

What the scan collects

Area	What we read	Why it matters
Navigator and UA-CH	User agent, Client Hints, platform, languages, hardware values	Must agree with each other and with the headers
Screen	Size, available size, color depth, pixel ratio	Must fit the claimed device
Intl	Timezone, locale, number and date formats	Must fit the IP location and languages
Canvas	Render hash, and a second render for stability	Real devices give the same hash each time
WebGL and WebGPU	Vendor, renderer, parameters, limits	Must fit the claimed GPU and OS
Audio	Audio processing hash	Depends on the real audio stack
Fonts	Installed fonts and text metrics	Font sets differ by OS
Codecs and DRM	Media and DRM support	Differ by browser, OS and build
Permissions	Permission states	Default states differ by browser
WebRTC	Local and public candidates	Can leak a real IP behind a proxy
Workers and iframes	The same values from other scopes	Must match the main page
Native integrity	toString, descriptors, prototypes	Shows JavaScript patches
TLS and HTTP	Handshake and header data at the edge	Must match the claimed browser
IP, ASN, timezone	Network owner and location	Datacenter ranges and timezone gaps are signals

How scoring works

Scoring runs on the server. The page sends raw values and gets the verdict back. The scoring rules are not in the page.

The score is coverage-aware. When a check cannot run, for example because an API is missing in your browser, we do not count it as a pass or a fail. We report it as not covered, and the score reflects how much was measured.

The model is versioned. Each result shows the model version that scored it. When we add checks or change weights, old results keep their version, so you can compare like with like.

What a good result looks like

Every browser has a fingerprint, so the goal is consistency, not having none. What gives a profile away is a contradiction: a Windows user agent with macOS fonts, a worker that reports other values than the page, a canvas hash that changes on each read, or a timezone that does not fit the IP.

Privacy

• No cookies. The scan sets none.
• Your IP is stored only as a hash.

Use it to compare tools

Run the same proxy through two antidetect browsers and compare the results. The scan checks the same layers we describe in how websites detect antidetect browsers. Our rankings weight the fingerprint engine at 22% for this reason. See /methodology for how the ranking itself is built.