Free tool

Browser Fingerprint Test

Without cookies or login your browser leaks dozens of unique signals. Measure how many you expose and what gives you away, fully locally.

Analyzes what unique information your browser reveals without cookies or logins. Everything runs on your device and nothing is sent to any server.

Built by

Miguel Ángel Colorado Marin (MACM)

Full-Stack Developer · Guadalajara, España

I develop web apps, digital tools and full projects — from design to deployment.

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Fingerprinting identifies users without cookies or accounts by combining small technical differences each device exposes: how the graphics engine renders text (canvas), which GPU WebGL reports, which fonts are installed, how the audio stack responds, even exact resolution and timezone. Classic industry studies (EFF's Panopticlick, Am I Unique) showed most browsers are unique among millions. This tool runs the same families of tests on your browser, computes a combined identifier with SHA-256 and estimates how many entropy bits you contribute — all inside your device, sending nothing to any server, because it's an educational privacy tool, not a tracker.

Features

  • ✓11 analyzed vectors: canvas, WebGL, fonts, audio...
  • ✓Combined SHA-256 ID of every signal
  • ✓Entropy bits and uniqueness estimate
  • ✓Practical tips to reduce it
  • ✓100% local analysis: nothing leaves your device

How do I test my fingerprint?

  1. 1

    Hit analyze

    The tool runs the probes against your current browser.

  2. 2

    Review each vector

    Rarer values (GPU, fonts) are the ones that identify you most.

  3. 3

    Compare browsers

    Open the tool in another browser or profile and compare IDs.

  4. 4

    Apply countermeasures

    Try Tor Browser or resistFingerprinting and watch the entropy drop.

Frequently asked questions

Do you store or send my fingerprint anywhere?

No. The probes run in JavaScript inside your browser and results never leave your device; verify it with DevTools (the Network tab shows zero requests while analyzing).

Is the uniqueness estimate exact?

It's a didactic approximation: fixed weights per vector based on industry literature, but real rarity depends on the compared browser population. Treat it as a relative indicator, not an absolute figure.

Is blocking cookies pointless if fingerprinting exists?

It's not useless: blocking cookies removes trivial persistent tracking and most commercial trackers still rely on them. Fingerprinting is an additional, harder-to-stop layer; both defenses complement each other.

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Embed Browser Fingerprint Test on your site

Add Browser Fingerprint Test to any web page with a simple iframe. Free, with attribution to miguelacm.es.

<iframe
  src="https://miguelacm.es/embed/browser-fingerprint"
  width="100%"
  height="700"
  frameborder="0"
  title="Browser Fingerprint Test — miguelacm.es"
></iframe>
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View source on GitHub