CreepJS

CreepJS

Educational, privacy-first browser fingerprinting platform for developers.

Product

  • Checker
  • Documentation
  • IP Risk Checker
  • API Playground

Resources

  • CreepJS 2.0
  • API Reference
  • Browser Fingerprinting Guide
  • Fingerprint Signal Index
  • Privacy Policy

Popular Signals

  • Canvas Fingerprint
  • WebGL Fingerprint
  • WebRTC Fingerprint
  • Anti-Fingerprinting Detection

Connect

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System

OS CPU

Operating system CPU info

Live Playground

Analyzing your browser...0%

API Docs

Endpoint

GET /api/fingerprint/os-cpu

Examples

About

OS CPU fingerprinting reads navigator.oscpu (Firefox-specific) or constructs similar info from other properties. Firefox returns strings like 'Windows NT 10.0; Win64; x64' or 'Intel Mac OS X 10.15'. This property is Firefox-specific, making its presence a Firefox identifier. The string reveals OS version, architecture, and sometimes processor details. Chrome and Safari don't expose oscpu, so its presence/absence helps distinguish browsers. The technique also checks for inconsistencies between oscpu and other OS indicators to detect spoofing.

Use Cases

  • •Firefox detection
  • •OS version
  • •Architecture info
  • •Browser consistency validation

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.