whoami — what you reveal

Why this matters: Cookies are tiny files placed on your device by websites — and often by other companies whose trackers are embedded in the site. They follow you across the web, building a profile of your browsing habits, purchases, and interests.

Why this matters: Browser fingerprinting is invisible and cannot be blocked by clearing cookies or using incognito mode. Your combination of browser, OS, fonts, GPU, screen, timezone, and dozens of other signals creates a signature that is often unique to you alone out of billions of internet users.

Why this matters: WebRTC is a browser feature for video/audio calls. A flaw in its design causes your real IP address to leak — even if you're using a VPN. Many VPN users don't know their true IP is exposed to every website they visit.

Why this matters: Your User-Agent alone tells a web server your exact browser version, OS, and device type. Combined with your IP and language settings, servers can build a detailed profile before you even click anything.

Why this matters: Battery status has been used as a tracking vector — a nearly-depleted battery creates a unique enough signature that it can re-identify users across sessions without cookies. CPU core count, RAM, and screen resolution together narrow your device to a small group, or even uniquely.

Why this matters: Once you grant a permission — even to a legitimate site — that site retains it until you manually revoke it. Malicious or compromised sites can silently use camera, microphone, or location access.

Why this matters: Ad networks and analytics tools record your every interaction — how long you hover, where your mouse goes, how far you scroll, when you go idle. This builds a behavioural profile that can identify you even without any account or cookie.