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DownloadDatasheetsPDF · EN4 pages

Datasheet: Device Fingerprint

Same device, new account? Now you recognize the device. Device Fingerprint recognizes browsers and devices through a browser SDK and returns a stable visitor_id per device, first and last seen, risk factors and a bot signal.

The file is available in English and German; you download the version in the language of this page. Free, no registration.

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What's inside

  1. Stable ID
  2. Verify at login
  3. Risk with reasons
  4. Bot detection
  5. Similar devices
  6. Devices on the same network
  7. Technical data
  8. In practice
  9. Frequently asked questions

Who it is for

For sign-in, checkout and account protection: via SDK, REST API and MCP.

Key facts

  • Signals: Canvas, WebGL, audio, fonts, hardware and screen via SDK, plus IP and user agent
  • Result: visitor_id, visits, first and last seen, device, risk 0–100 with factors, bot signal
  • Access: Browser SDK with a publishable key, REST API /fingerprint, MCP in the /mcp-full catalog
  • Privacy: Device data separated per organization, deletion per ID with POST /privacy/forget
Format
PDF
pages
4
Language
English
Last updated
10/2026

Questions and answers

Frequently asked questions about this download

Which signals does the SDK use?

Canvas, WebGL, audio, fonts, hardware and screen properties, plus mouse, keyboard and touch patterns for bot detection. On the server, IP and user agent are added.

How do I recognize a known device?

identify reports is_new and visits. GET /fingerprint/device returns first and last seen, visits, browser, platform and country for a visitor_id.

How do I handle deletion requests?

POST /privacy/forget deletes the device profile, links, history and alerts for the ID in your organization. A tombstone keeps the same ID from being captured again.

Who is responsible for the data?

As the controller, you set purpose and legal basis. The identify response lists data categories, purposes and the recommended legal basis in its compliance block.

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