Collectors

Neoprint ships with 20 built-in collectors. Each independently gathers a browser signal and reports its entropy and stability.

Built-in Collectors

Collector	Signals	Entropy	Stability
canvas	2D rendering, gradients, emoji	~10 bits	0.85
webgl	GPU vendor/renderer, extensions, limits	~12 bits	0.95
audio	OfflineAudioContext oscillator	~8 bits	0.80
fonts	48 font families via measureText	~12 bits	0.90
screen	Resolution, DPR, HDR, color gamut	~6 bits	0.70
navigator	UA, platform, languages, memory	~8 bits	0.75
timing	Timer precision, timezone	~5 bits	0.60
media	Video/audio codec support	~7 bits	0.85
storage	Storage availability, quota	~4 bits	0.60
network	Connection type, RTT, downlink	~3 bits	0.30
gpu	WebGPU adapter info, features	~10 bits	0.90
math	Math function precision (22 ops)	~6 bits	0.95
intl	Locale, timezone, numbering system	~5 bits	0.85
cssFeatures	CSS.supports() for 20 features	~4 bits	0.80
permissions	Permission states for 14 APIs	~5 bits	0.65
speech	Available TTS voices	~10 bits	0.90
domRect	getBoundingClientRect precision	~6 bits	0.75
svg	SVG rendering + text BBox	~7 bits	0.80
webrtc	ICE candidate types	~4 bits	0.50
hardwarePerf	CPU micro-benchmarks (float, trig, sort, matrix)	~4 bits	0.50

Total: ~135+ bits of entropy — enough to uniquely identify >1 billion devices.

Selecting Collectors

// Use all (default)
const fp = await neoprint.get()

// Use specific collectors
const fp = await neoprint.get({
  collectors: ['canvas', 'webgl', 'math', 'fonts']
})

// Privacy mode — excludes invasive collectors
const fp = await neoprint.get({ mode: 'privacy' })

// Incognito-resistant — excludes volatile collectors
const fp = await neoprint.get({ mode: 'incognito-resistant' })

Custom Collectors

neoprint.register('mySignal', {
  async collect() {
    const value = await getMyCustomData()
    return { value, entropy: 5 }
  },
  stability: 0.8,
})

See the Plugin System guide for details.