FingerprintJS

FingerprintJS is a browser fingerprinting library that generates unique visitor identifiers based on device and browser characteristics. It collects signals like canvas fingerprint, WebGL rendering, audio context, screen resolution, installed fonts, and dozens of other browser attributes to create a stable visitor ID. The library helps identify users across sessions and even when they clear cookies or use private browsing modes. FingerprintJS is used for fraud detection, bot prevention, personalization, and analytics where persistent user identification is needed. The open-source version provides basic fingerprinting, while the commercial Fingerprint Pro service offers 99.5% accuracy with server-side processing and advanced bot detection. It implements privacy-conscious identification that doesn't rely on third-party cookies or require personal information. FingerprintJS is widely adopted by e-commerce platforms, financial services, and applications requiring secure user identification.