Show HN: Everything a web page can learn about you, in plain English
3 days ago
- The page demonstrates what information a single web page can gather about a browser, device, and person, without contacting third parties.
- It measures various signals like user agent, plugins, fonts, canvas rendering, language, screen resolution, HTTP headers, timezone, etc., and their entropy (bits of identifying information).
- The page emphasizes that it does not store or share data; it only computes in-browser.
- It explains that entropy is not additive due to correlations, so the real combined identifier is lower than the sum.
- It lists HTTP headers and client hints that browsers send automatically.
- It shows network connection details and server-derived context (IP, proxy, etc.).
- It discusses cross-site tracking and how the page writes identifiers in multiple places to survive clearing.