System

Font Preferences

System default fonts

Live Playground

Analyzing your browser...0%

API Docs

Endpoint

GET /api/fingerprint/font-preferences

Examples

About

Font preferences fingerprinting detects system default fonts for generic families (serif, sans-serif, monospace, cursive, fantasy) by rendering text and measuring dimensions. Different operating systems ship with different defaults: Windows uses Times New Roman/Arial/Consolas, macOS uses Times/Helvetica/Courier, Linux uses Liberation/Ubuntu fonts. These defaults provide OS detection with 70-80% accuracy. User customization of default fonts is rare but creates highly unique fingerprints. Professional users may customize fonts: developers install coding fonts (Fira Code, JetBrains Mono), designers have Adobe fonts. This reveals OS, OS version, language packs, professional software, and user customization. Highly stable per system.

Use Cases

•OS detection
•OS version identification
•Font customization
•Professional software detection

Other Fingerprints

Compare related fingerprint signals

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

Core pages

Browser Fingerprinting PlatformRun a privacy-first browser fingerprint check and learn what websites can infer about your device.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.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.