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Browser Fingerprint Test

A VPN changes your IP address, but your browser still describes itself in detail. Websites can combine those details into a fingerprint that follows you without cookies.

Your fingerprint ID
Reading your browser…

    Test if you can be tracked

    1. Note your fingerprint ID on the left.
    2. Open osir.co.uk/tools/browser-fingerprint/ in a private or incognito window, a different browser profile, or after turning your VPN on or off.
    3. If the ID is the same, or it says "we recognised this browser", websites can follow you across those sessions with no cookies at all.

    We only recognise browsers from their fingerprint on this site. Advertising networks do the same across thousands of sites.

    Your IP address

    216.73.216.145
    Provider
    Amazon.com, Inc. AS16509
    Country
    United States
    Hostname
    None
    You appear to be using a VPN or proxy, so your real IP is hidden. The fingerprint below is not.

    How unique are you?

    Compared with recent visitors to this site.

      Extensions and add-ons that left traces

      Most extensions are invisible to websites, but many inject code or elements into every page. Password managers often reveal themselves on login forms like this one (don't type anything):

      • Looking…
      Headers your browser sent with every request (3)
      HeaderValue
      Accept*/*
      Accept-Encodinggzip, br, zstd, deflate
      User-AgentMozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

      What a VPN hides, and what it doesn't

      • Hidden by a VPN: your real IP address, your internet provider, your rough location, and (with leak protection) your DNS lookups.
      • Not hidden: your graphics card, screen, fonts, time zone, language, browser version, extensions, and how your device draws images and processes sound.
      • Combined, these traits are often unique among millions of browsers. Trackers use them to link your VPN browsing to your normal browsing.

      How to be harder to fingerprint

      • Tor Browser or Mullvad Browser make every user look the same.
      • Brave randomises canvas, audio and other traits per site.
      • Firefox: turn on Enhanced Tracking Protection "Strict", which blocks known fingerprinting scripts.
      • Use fewer extensions, keep your browser up to date, and avoid unusual fonts or screen setups.
      • Run this test again afterwards: a changing ID, or one shared by many visitors, means you're harder to track.

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