Browser Fingerprint Test

What this check compares

Websites see more than your IP address. Your browser reports its time zone, its languages, a user agent naming the browser and operating system, and, through WebRTC, sometimes another IP. This page reads those in your browser and compares them with what your IP address says: its country and time zone, from our IP lookup. Each check passes when the two fit together and is flagged when they don't.

Everything except the IP lookup runs in your browser. The lookup is the same one the IP address lookup page makes, and the WebRTC check works like the WebRTC leak test.

Why consistency matters with a proxy

When you test a site from another country through a proxy, for ad verification, price checks or localisation QA, the site decides what to show from all of these signals, not the IP alone. A German IP with a browser set to New York time and English only can get English pages, US dates or a different currency, which spoils the test.

A flagged check isn't an error. Plenty of people travel or prefer English, and sites see that every day. It tells you which setting to change if you want to see a site the way people in the proxy's country see it.

What it doesn't check

This isn't a score of how unique your browser is, and it can't predict how a given site will treat you. Sites can also look at things this page doesn't compare, such as screen size, fonts, graphics hardware and how you use the page. It checks the few signals that should agree with your IP address, and explains each one.

• WebRTC leak test
• IP address lookup
• HTTP headers checker

Questions