System

Font Detection

Installed system fonts detection. Discover which fonts are available on your system.

Live signal

Analyzing your browser…0%
Measuring baseline fonts
Testing system fonts
Checking custom fonts
Analyzing render dimensions
Building font signature

API integration

Send a complete collected fingerprint to the authenticated API endpoint.

fetch('https://api.creepjs.org/v1/fingerprint', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Token': 'YOUR_API_TOKEN'
  },
  body: JSON.stringify(fingerprint)
});

What CreepJS reports

CreepJS runs the Font Detection collector in the current browser. It inspects the browser surface represented by this system signal and reports the observed value or availability state, collection timing, and any collector error. The live result is local browser evidence, not a population estimate.

How to interpret it

Use Font Detection as one observation alongside other signals. Different browsers, devices, settings, and permissions may return different values. An unsupported or blocked API may return no value. A single signal does not identify a person.

Limits

This reference makes no uniqueness, match-rate, or fraud-probability claim. Results can change after browser, operating-system, hardware, permission, privacy-setting, or driver changes. Treat unavailable data as unavailable, not as evidence of safety or risk.

Test the signal

Reviewed: 2026-07-28.

Compare related fingerprint signals

Move from this collector to the CreepJS signal index, live checker, API docs, and other high-value fingerprinting explainers.

Tools and guides

Browser Fingerprint Checker & IP Risk AnalysisRun a privacy-first browser fingerprint check, inspect IP risk context, and learn what websites can infer about your device and network.Fingerprint CheckerTest your browser privacy with a live fingerprint scan, collector coverage, and privacy leakage analysis.IP Risk CheckerCheck IP risk, ASN, geolocation, proxy, VPN, Tor, datacenter, and routing signals through the CreepJS API.Browser Fingerprint SignalsBrowse the full CreepJS library of browser fingerprinting signals, including canvas, WebGL, WebRTC, fonts, storage, and privacy checks.How to Tell If an IP Is a ProxyCheck an IPv4 or IPv6 address for proxy, VPN, Tor, datacenter, network, risk, and evidence signals, then learn how to interpret the result.DocumentationRead the CreepJS API, SDK, collector, and integration documentation for privacy-first browser fingerprinting.API PlaygroundGenerate a token, inspect sample payloads, and test CreepJS browser fingerprinting API calls.What Is Browser Fingerprinting?Learn how browser fingerprinting works, which signals are collected, and how privacy tools reduce tracking.

Popular fingerprint signals

Canvas FingerprintCanvas rendering fingerprint based on how the browser draws graphics. Test your browser's unique canvas signature.WebGL FingerprintWebGL GPU information and rendering capabilities. Detect your graphics card and WebGL implementation.WebRTC FingerprintWebRTC capabilities and IP leakage checks. Detect peer connection support and potential network exposure signals.Anti-Fingerprinting DetectionDetection of privacy tools and browser modifications. Identify fingerprint resistance.Navigator InformationBrowser navigator properties and user agent information. Analyze browser capabilities and settings.Font DetectionInstalled system fonts detection. Discover which fonts are available on your system.