Browser fingerprint test: check your browser fingerprint online

Network leak test

Your browser fingerprint is one half of what a website sees; your network is the other. Check whether your browser reveals an IP address that your VPN or proxy is supposed to hide.

Full WebRTC leak test and how to fix a leak

What the results mean

• Visitor ID: the identifier the server matched or created for this browser. It is computed on the server, so a page script cannot choose it.
• Seen before: whether this browser was recognised from an earlier test, even after clearing cookies or switching to a private window.
• Identity confidence: how closely your signals matched the stored device, from 0 to 100. A browser seen for the first time starts at 35, or 55 when another browser on the same computer was already seen. Small changes, such as a browser update, still match.
• Trust score: 100 minus deductions for signs of automation, tampering, software rendering, a datacenter or Tor IP, or a time zone that does not fit the IP address.

Am I unique?

Each signal on its own is shared by many people. Combined, they usually narrow a browser down to one device. That is why the same visitor ID comes back in a private window: private browsing removes cookies and history, but the hardware, fonts and rendering stay the same.

Identical devices, such as two phones of the same model on the same software version, share most signals. A good fingerprinting system knows this and treats those devices as a shared class instead of claiming they are one person.

Chrome fingerprinting, Safari and Firefox

Chrome exposes the full set of canvas, WebGL, audio and font signals, so a Chrome fingerprint is usually stable across sessions. Safari and Firefox reduce or add noise to some signals, and Brave randomises several of them per site. Server-side matching compares each signal separately and tolerates partial changes, which keeps most browsers recognisable.

How to reduce your browser fingerprint

You cannot remove a fingerprint, but you can make it less distinctive.

• Use a browser with built-in fingerprinting protection, such as Firefox with resist fingerprinting, Brave or the Tor Browser.
• Avoid installing unusual fonts and extensions; each one adds detail.
• Keep the window at a common size and the browser up to date.
• Note that a VPN changes your IP address, not your fingerprint.

For developers: stop free-trial and coupon abuse

This page runs the same browser agent that FingerPrint Checker customers use. Your backend sends the result to one API call and gets back allow, deny or a human check when someone claims a free trial, a coupon, a sign-up bonus or a referral reward. SDKs are available for the web, Android, iOS and macOS, and every account starts with 2,000 free checks.

Frequently asked questions