Font Fingerprinting: The Invisible Browser Tracker That Reveals Your System

Font fingerprinting is a highly stable and reliable browser tracking technique that detects installed system fonts via JavaScript methods like canvas measurement and CSS probing. Unlike cookies or IP addresses, font lists rarely change and persist across browser restarts, private browsing, and VPNs, uniquely identifying 60-70% of users. Mitigation options include font spoofing extensions (often detectable) and anti-detect browsers that randomize font fingerprints per profile.