What does a browser fingerprint audit actually check?

It probes canvas rendering, the WebGL renderer, an audio oscillator, 20 test fonts, screen size, user agent, languages, platform, timezone, media preferences, touch and cookie settings, then combines them into one hash.

How do I test whether Brave Shields or CanvasBlocker is working?

Run the audit, turn on your protection, then press Run again. If the hash changes, the changed probes are flagged. An identical hash means your signals are stable and trackable.

If the hash changes between runs, am I fully protected from tracking?

Not necessarily. A changed hash means at least one signal is randomized, which reduces trackability, but other stable signals can still identify you. A stable hash is a prerequisite for tracking.

Why do canvas, WebGL or audio show blocked or unavailable?

The probe failed or the browser refused it. Privacy browsers and extensions can block canvas and audio reads, and WebGL shows unavailable when the browser provides no WebGL context.

Is my fingerprint sent anywhere, and can I save the result?

Probes run in your tab and the hash is computed locally with the Web Crypto API. Use Copy hash, or Download report to save a fingerprint-report.json file.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install.

🕵️

Free Browser Fingerprint Auditor

See exactly what tracking scripts learn about your browser — canvas, WebGL, audio, fonts, screen, timezone and more — plus a SHA-256 composite hash. Run twice to confirm your privacy mitigations work. Nothing is uploaded.

Runs in your browserNo sign-up, no pop-upsNo login requiredFree forever12 privacy probesSHA-256 composite hash

Works offline once loaded

Your composite fingerprint hash

Probing…

This audit runs entirely in your browser. Every probe runs in your tab; the composite hash is computed locally with the Web Crypto API. Nothing about your fingerprint is uploaded.

The hash represents what a tracking script could use to identify you across visits even with cookies cleared. Run the audit twice — if the hash changes, your mitigations (Brave Shields, CanvasBlocker, Firefox resistFingerprinting) are working.

How It Works

Runs the same fingerprinting probes that tracking scripts use — canvas, WebGL, audio, fonts, screen, timezone and more — then hashes the combined signature locally so you can see exactly what a site could use to identify you across visits.

1
Probes run in your browser
A canvas is drawn and read back, the WebGL renderer is queried, an offline AudioContext renders a known oscillator, and ~20 other signals are collected.
2
Everything is hashed locally
The combined fingerprint is SHA-256-hashed with the Web Crypto API. The hash never leaves your device.
3
Re-run to test mitigations
With Brave Shields, CanvasBlocker, or Firefox resistFingerprinting enabled, a second run should produce a different hash. A stable hash means you are uniquely trackable.

Nothing is uploaded. Every probe and hash is computed in your browser; we do not collect or transmit any fingerprint.

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Frequently Asked Questions