1. Your device and browser
Every site can read these without asking. On their own most look harmless; together they narrow you down.
2. Fingerprint
A fingerprint mixes many small details into one ID. It is often near-unique, works without cookies, and survives clearing your history or using private mode.
3. Your network
Your IP address is sent with every request, so every site you visit already has it. The button below shows what it says about you. Nothing is looked up until you click.