FingerprintJS
lastmod 2026-11-10created 2025-11-242 edits
FingerprintJS is an open-source JavaScript library that generates browser fingerprints (browser fingerprinting). Without cookies or login, it combines browser characteristics such as screen resolution, fonts, canvas rendering output, and plugins to create an identifier that distinguishes visitors. It is used for fraud detection and visitor tracking, and comes as an open-source edition and a commercial service with higher accuracy.
The most advanced open-source browser fingerprinting library