What Browser Fingerprinting Checks

Browser fingerprinting combines many small browser and device signals to estimate whether two visits may come from the same environment.

No single field is usually enough. The uniqueness comes from the combination of browser version, platform, screen size, timezone, language, rendering behavior, and available features.

Canvas, WebGL, and Audio checks draw or render small test patterns and hash the result. Different GPUs, drivers, fonts, and browser settings can produce slightly different outputs.

Privacy-focused browsers may block or randomize these surfaces. That can improve privacy, but it can also make some tests show as unavailable.

Language, timezone, platform, screen size, device pixel ratio, hardware concurrency, memory hints, plugins, and font availability all describe the browser environment.

Some values are stable and useful for debugging. Others are noisy, browser-dependent, or intentionally reduced by modern privacy protections.

A fingerprint hash is a compact representation of a test result. It is not a password, not a permanent identity, and not guaranteed to be unique.

Two devices can share the same hash if their browsers and rendering environments are similar. A hash changing over time can also be normal after browser, OS, driver, or font updates.