Device identification

Identify visitors with
unmatched accuracy

An immediate, persistent ID for every web visitor — human, bot, or AI agent.

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Why Fingerprint

Identify more devices with greater accuracy

Catch sophisticated fraudsters

Link current users to past fraud, even when they hide their identity.

Reduce friction for trusted visitors

Skip 2FA and OTP more often, and personalize experiences for logged-out users.

Accurate on web and mobile

Identify users with confidence on every browser and device, including iOS, Android and Safari.

Longer identification lifetimes

Tie historical, behavioral, and biometric data to your users over months, not days.

With accurate visitor ID history, you can challenge untrusted traffic while personalizing experiences for trusted visitors
Other services can only
accurately identify 60%
of returning visitorsIncoming flow of unidentified clients
Fingerprint uses an innovative combination of browser fingerprinting, IP/URL analysis, device analysis, and machine learning to accurately identify unique visitors.

Made for developers

Build the most accurate device identifier into your fraud prevention and user experience workflows. 

{
  "visitor_id": loading...,
  "events": [
    {
      "incognito": loading...,
      "ip_address": loading...,
      "browser_details": { ... },
    }
  ]
}

Built on FingerprintJS, a proven open-source library

Used since 2012 to identify billions of users, with unparalleled accuracy, ease of use, and security.

Server-side visitor history API

Pull suspicious activity and geolocation into your server-side business rules or sign-up flow.

Webhooks for flexible workflows

Get instant, secure notifications in your back end to build scalable, asynchronous processes.

What's included in the identification response?

100+ browser and mobile signals, combined with TLS identifiers, cookies, visit history, and geolocation, produce a highly accurate device identifier.

Anonymous user identification

Every visitor gets a permanent visitor ID, even when they conceal their identity behind proxies or other techniques.

Incognito mode detection

Detect incognito mode and identify the same user across incognito sessions.

Start collecting visitor IDs today

Install our JavaScript snippet and start collecting visitor IDs, geolocation, and more — free, in under 10 minutes.

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