Fingerprint | Identify Every Web Visitor & Mobile Device
The Fingerprint device intelligence platform works across web and mobile applications to identify all visitors with industry-leading accuracy — even if they’re anonymous.
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FingerprintJS is the most advanced open-source browser fingerprinting library and a SaaS device intelligence platform that identifies unique web visitors and mobile devices to prevent fraud without relying on cookies.
🚀 Overview
FingerprintJS provides stable, persistent visitor identifiers by analyzing over 100 browser and device signals, solving the problem of anonymous fraud, bots, account takeovers, and unreliable tracking in a cookie-less world.
It is built for developers integrating into web and mobile apps, and businesses in fintech, e-commerce, and beyond who need real-time fraud prevention and user trust enforcement.
The FingerprintJS team built it as the original, most accurate client-side fingerprinting solution, evolving into a full platform with server-side Pro features for enterprise-scale accuracy and signals like VPN detection and geolocation.
✨ Key Features
- Generates hashed
visitorIdfrom browser attributes, persistent in incognito mode and after data purge (99.5% accuracy in OSS, 99.7% in Pro) - Pro signals: VPN/IP geolocation detection, browser tampering/bot detection, incognito mode, rooted devices, IP blocklists, high-activity identification
- Easy integration via CDN script or NPM, with SDKs for web, mobile (Android/iOS), and servers (Node.js, etc.)
- Real-time API (50M+ events/day), webhooks, supports 250+ countries; upcoming: enhanced mobile support
🛠 Tech Stack
- Frontend/Client: TypeScript/JavaScript (ES2018+), Rollup bundler, compatible with React/Vue/Angular
- Backend/Pro API: Proprietary cloud service with Node.js/Python/etc. SDKs
- Database: N/A for OSS library (client-side only)
- Auth: API keys for Pro dashboard
- Hosting: openfpcdn.io CDN for OSS, Fingerprint cloud for Pro
👥 Who Is This For?
This project is useful for:
- Developers who want to add cookie-less user identification and basic fraud signals
- Teams looking for scalable bot/fraud prevention in fintech, payments, e-commerce
- Indie makers building secure web/mobile apps without third-party trackers
📸 Screenshots / Demo
- Live demo: https://fingerprintjs.github.io/fingerprintjs
- Pro demo: https://demo.fingerprint.com/playground
- GitHub: https://github.com/fingerprintjs/fingerprintjs
🔥 Project Status
- 🟢 Actively building
Last updated: 2026-03-19
❓ FAQ
Is this project free?
Freemium / Open Source — OSS library fully free (MIT license), Pro SaaS offers free tier for visitor IDs/signals, paid enterprise plans for full features.
Is the source code available?
Yes — https://github.com/fingerprintjs/fingerprintjs (client library; Pro server-side is closed-source)
Can I contribute?
Yes — Follow CONTRIBUTING.md, submit issues/PRs on GitHub, join Discord community, or email oss-support@fingerprint.com for support.
📬 Contact & Links
- Website: https://fingerprintjs.com
- GitHub: https://github.com/fingerprintjs/fingerprintjs
- Twitter/X: https://x.com/FingerprintJS
- Email: oss-support@fingerprint.com
Built with ❤️ and kept warm on WarmIndex.
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