ThumbmarkJS is an MIT-licensed browser fingerprinting library that produces stable fingerprints with 90% uniqueness. It works with normal and private browsing.

ThumbmarkJS is a free, open‑source browser fingerprinting JavaScript library, designed as an alternative to FingerprintJS. It generates distinct, persistent device fingerprints using web APIs like canvas, audio, fonts, WebGL, and more, enabling identification of browsers across sessions, even in incognito or cleared-cache scenarios. It supports both client-side-only installs via CDN and npm, with optional API integration for improved uniqueness.

Features

  • Browser fingerprinting with high uniqueness and stability
  • Generates a persistent binary fingerprint (thumbmark) based on multiple browser characteristics including audio, canvas, WebGL, fonts, plugins, system detailsSu
  • Fast. Doesn't hurt page performance.
  • Small footprint (<300kB)
  • API available for even higher uniqueness.
  • Extensive documentation and demo page that logs anonymous fingerprints to help improve reliability and field robustness
  • Generates a persistent binary fingerprint (thumbmark) based on multiple browser characteristics including audio, canvas, WebGL, fonts, plugins, system details
  • pports both client‑side usage (via script tags or npm import) and enhanced API-backed fingerprinting for ~99 % uniqueness
  • Includes configuration options (exclude, include, performance, logging, stabilize presets) for customizable performance and entropy trade-offs
  • Allows injection of custom components into fingerprint via includeComponent(...)
  • Bundled for UMD, CommonJS, and ESM module formats via JSDelivr CDN or npm package

Project Samples

ThumbmarkJS Screenshot 1 ThumbmarkJS Screenshot 2

Project Activity

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Categories

Browser Fingerprinting

License

MIT License

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ThumbmarkJS Web Site

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Additional Project Details

Operating Systems

Android, Apple iPhone

Programming Language

JavaScript, TypeScript

Related Categories

JavaScript Browser Fingerprinting Software, TypeScript Browser Fingerprinting Software

Registered

2025-08-06
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