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What does my browser tell every site?

Any website can read details about your browser and device without asking and without cookies. Put together, they can recognise your browser again. See yours.

This runs only on this page: nothing is sent to us or anyone else.

How often was a browser unique?
  • 2010 · EFF83.6%

    470,161 browsers. The author calls the sample “quite biased”.

  • 2016 · AmIUnique89.4%

    118,934 fingerprints from the researchers' AmIUnique site.

  • 2018 · a top-15 French website33.6%

    2,067,942 fingerprints from one of the top 15 French websites (35.7% on computers, 18.5% on phones).

The results differ with who was measured. Being unique matters only if a site uses it to recognise you.

What you can do

  • Clearing cookies doesn't stop it. The W3C, which writes web standards, says clearing cookies or using a VPN does “not prevent further correlation”.
  • Firefox “blocks known fingerprinters and adds broader protections for suspected fingerprinters”, says Mozilla.
  • Brave takes the other approach: it “aims to make every browser look completely unique”, different on each site and each session.
  • Tor Browser is “specifically engineered to minimize the uniqueness of each user's fingerprint”, says the Tor Project.
Sources (7)Where each fact comes from