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Device Fingerprinting

Identify devices across sessions without cookies.

Overview​

Device fingerprinting creates a unique identifier by combining:

  • Browser properties
  • Canvas rendering
  • WebGL capabilities
  • Audio processing
  • Installed fonts

How It Works​

graph LR
    A[Browser Data] --> B[SDK]
    B --> C[Hash Components]
    C --> D[Device Fingerprint]

Collecting Device Signals​

JavaScript​

import SimplrFraud from '@simplr-ai/js';

const simplr = new SimplrFraud();
const signals = await simplr.collect();

// Send to your backend
await fetch('/api/check', {
  method: 'POST',
  body: JSON.stringify({
    email: 'user@example.com',
    device: signals.device
  })
});

Flutter​

final simplr = SimplrFraud();
final signals = await simplr.collect(context);

// Send to your backend
await api.post('/check', {
  'email': 'user@example.com',
  'device': signals.device.toJson()
});

Device Signals​

SignalDescription
fingerprintUnique device hash
device_idPersistent ID (localStorage)
is_new_deviceFirst time seeing this device
is_headlessAutomated browser detected
is_webdriverSelenium/Puppeteer detected
canvas_blockedFingerprinting blocked

Use Cases​

Detect Multi-Accounting​

Same device creating multiple accounts:

{
  "device": {
    "fingerprint": "fp_abc123",
    "seen_count": 5,
    "accounts_linked": 3
  },
  "risk_score": 70
}

Bot Detection​

Automated browser without human behavior:

{
  "device": {
    "is_headless": true,
    "is_webdriver": true
  },
  "risk_score": 95
}

Privacy Considerations​

  • No personal data collected
  • Hashes are one-way
  • Users can reset device_id
  • Disclose in privacy policy