FingerprintJS fingerprints browsers across incognito sessions

FingerprintJS shows why a VPN alone does not make a browser anonymous: it changes the network path, not the browser’s recognizable software and rendering signals. Developers should treat the result as a probabilistic abuse-prevention signal, not as authentication.

• –Incognito mode clears local browsing state but generally leaves enough browser characteristics for repeat identification.
• –The client-side implementation is transparent and easy to integrate, but also easier to reverse-engineer and spoof than server-assisted commercial alternatives.
• –Privacy-focused browsers and anti-fingerprinting defenses can reduce fingerprint stability, accuracy, or uniqueness.
• –Strong use cases include fraud scoring, account-abuse detection, and visitor deduplication—not irreversible identity claims.
• –VPN detection and browser fingerprinting solve different problems; combining multiple signals is more reliable than relying on either alone.