Every site you open can read these signals about you — automatically, before you click a thing. GLASS shows you the same thing, one card at a time. Nothing here leaves your device — this is just for you.
🔒 on-device only · nothing stored · nothing sent
◉ Your browser
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The name and version of your browser and operating system.
Why it matters: combined with the cards below, this helps sites recognize your device even without cookies.
▭ Your screen
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Your screen size, pixel density, and color depth.
Why it matters: screen details are surprisingly unique — they narrow down which device is yours.
◷ Time & language
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Your timezone and preferred languages.
Why it matters: these hint at where in the world you are and what you speak — before you ever share it.
⇅ Connection
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Whether your connection to this page is encrypted.
Why it matters: on an unencrypted (http) page, others on your network can read what you send.
❖ Canvas fingerprint
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A hidden ID drawn from how your device renders graphics.
Why it matters: this "fingerprint" can follow you from site to site with no cookie and no login — and it's hard to turn off. Knowing it exists is the first step.
🛡 Privacy signals
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Whether your browser is asking sites not to track you.
Why it matters: "Do Not Track" and "Global Privacy Control" are your requests — but sites can ignore them.
◎ Approximate location the only network call on this page
Not requested.
GLASS never asks for your location unless you press this button.
Why it matters: location is powerful and permanent once shared. This shows how one tap hands it over — with your consent, and only then.
GLASS only reads what's already visible to any website and shows it back to you. It stores nothing and sends nothing. This tool is free, always.