What this
page knows
You have not clicked anything, logged into anything, or agreed to anything. This is what the page learned about your machine anyway, in the time it took to load.
Every site you open learns the same things. Most of them keep it. Combined, these values are often unique enough to recognise you again without a cookie — that is called fingerprinting, and no setting in your browser turns it off. We keep none of it. There is no server behind this page, nothing is transmitted, and the moment you close the tab it is gone.
Read straight off your browser
Why this matters
Any one line below is harmless. The combination is the problem: screen size, time zone, language list, fonts, graphics card and a dozen others together make a value that is often unique in millions.
A site that records that value recognises you on your next visit with no cookie, no login and nothing to delete. Clearing your history does not change it. Private browsing does not change it. A VPN hides where you are, not which machine you are.
of entropy in the values on this page alone, by a rough count. Around 33 bits is enough to single out one person on earth. This page cannot measure how rare your particular values are — that would need a database of everyone else's, which is exactly the thing we are not building.
What actually helps
- Tor Browser makes everyone look identical on purpose. It is the only real answer to fingerprinting, and it is slow because of what it is doing.
- Don't resize the window. A maximised window on a common screen is more anonymous than one you dragged to an unusual size.
- Fewer extensions. Each one you add makes you rarer, including the privacy ones.
- A VPN changes your address, not your fingerprint. Useful against your ISP, close to useless against a site that fingerprints.