اقرار

Interactive piece

You are the traffic

Every page you load hands the server a small description of your browser. Press the button to see the part this page can read, laid out the way an analyst would see a flow record.

Before you press it

When you press it, this page reads your user agent and UA client hints, languages, time zone, screen size and pixel ratio, color scheme, CPU thread count, a hash of how your browser draws a small test image (canvas), and which of 28 common fonts are installed. Nothing is read before you press it.

All of it stays in this tab. Nothing is sent anywhere and nothing is stored, and it is wiped when you leave. You can check: after the page has loaded, your browser's developer tools show no further network requests and nothing written to storage, even after you press the button.

This needs JavaScript, and everything happens inside this tab.

FLOW 0000 example record verdict=?Example, not you

FieldValueTypical identifying power
src.user_agentMozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36~10 bits Browser, version and OS in one string. (Eckersley 2010)
src.ua_hintsGoogle Chrome 140, Chromium 140; Windows 15.0.0; x86 64-bit; desktopn/a The structured, newer form of the user agent; mostly overlaps with it.
src.languagesen-GB, en~6.09 bits Measured together with the other HTTP Accept headers; language alone is somewhat less. (Eckersley 2010)
src.timezoneEurope/London (UTC+01:00)~3.04 bits Narrows you to a region. (Eckersley 2010)
src.screen1920x1080, 24-bit color, pixel ratio 1.25~4.83 bits Measured as resolution and color depth; pixel ratio adds a little more. (Eckersley 2010)
src.color_schemelightn/a Light or dark: at most 1 bit, by definition.
src.cpu_threads8n/a Only a handful of common values, so a few bits at most. Not measured in these studies.
src.canvas_sha2563f6c1a9e0b27d4c8...~8.3 bits Tiny differences in how your GPU, drivers and fonts draw the same image. (Laperdrix et al. 2016)
src.fonts7 of 28 checked: Arial, Calibri, Cambria, Consolas, Georgia, Segoe UI, Verdanan/a A full font list measured 13.9 bits (Eckersley); checking a short list like this one reveals far less.

After you press the button, this box gives an approximate sense of how identifying your values are. The figures in the table are population averages from published studies, not a measurement of you: this site keeps no data to compare anyone against.

How to reduce this

You can't disappear from fingerprinting entirely. The practical goal is to look like as many other people as possible.

  • Use a browser with fingerprinting protection switched on: Firefox with Enhanced Tracking Protection set to Strict, Brave, or Mullvad Browser. For the strongest protection, Tor Browser makes its users look alike on purpose.
  • Prefer common settings over clever ones. A rare mix of extensions, languages or tweaks can make you stand out more, not less.
  • Keep your browser updated. Old versions get rarer, and rarer is more identifying.
  • Think twice before installing unusual fonts system-wide; each one is another signal.
  • Private windows clear cookies, not your fingerprint. They help against being linked over time, not against being recognized.

Test your browser properly with EFF's Cover Your Tracks

Sources: Eckersley 2010, "How Unique Is Your Web Browser?" (470,161 browsers); Laperdrix et al. 2016, "Beauty and the Beast" (118,934 fingerprints).