GlassBox – what the browser reveals, and how identifiable you are

In plain words

GlassBox is a browser diagnostic tool that displays all signals and data a website can collect from a user's browser to assess how identifiable they are across sessions and devices. The tool runs entirely locally without sending data externally, and allows users to compare fingerprint reports from different browsers or sessions to understand how tracking systems identify the same machine or browser. It is designed for anyone concerned about their digital privacy and browser fingerprinting.

written from the facts on this page · September 2026

From the sources

Glassbox shows you exactly what your browser hands to every site you visit: canvas and WebGL fingerprints, fonts, timezone, hardware signals, WebRTC IP leaks, and the trackable combination they form. Everything runs in your browser. Nothing is uploaded, stored, or sent anywhere. Built by a security engineer who wanted to see his own fingerprint the way trackers see it, then fix it. Open source, no account, no backend. Open the box, see what's leaking, close the gaps.

See every signal a website can read from your browser, and how identifiable it makes you. The probes run in your browser and their results are never uploaded.

Paste a JSON report from another browser or session (Copy JSON report → paste here). GlassBox scores each tier and tells you whether it's the same machine , same engine family, or same browser — the way a real cross-browser tracker linksfrom glassbox.codecanary.org

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