Analyzing Device Vectors...
How Browser Fingerprinting Tracks You Without Cookies
When third-party cookies were blocked by modern browsers, commercial surveillance networks switched to browser fingerprinting. By collecting subtle hardware variations in your GPU, canvas drawing routines, and audio buffers, trackers can re-identify your machine across different web sessions.
WebRTC enables real-time peer-to-peer audio and video in browsers. However, STUN candidate signaling can bypass your VPN or proxy tunnel and leak your true public IP or local subnet address.
Different graphics cards, operating systems, and font smoothing algorithms render text and 2D shapes with minute mathematical variations at the sub-pixel level. A single cryptographic hash of the canvas buffer acts as an persistent identifier.
Unlike commercial fingerprinting test sites that store your browser profile in their tracking databases, OverlayCheck executes all diagnostic APIs locally inside your browser tab without saving any telemetry.