WebGL Fingerprinting

WebGL fingerprinting extracts GPU hardware information and rendering parameters through the WebGL API. It's one of the highest-entropy signals available because GPU configurations vary enormously across devices.

How it works

Neoprint creates a hidden <canvas>, initializes a WebGL2 (or WebGL) context, and reads hardware parameters and capabilities.

Collected signals

Signal	Source	Example
Vendor	WEBGL_debug_renderer_info	Google Inc. (Apple)
Renderer	WEBGL_debug_renderer_info	ANGLE (Apple, ANGLE Metal Renderer: Apple M4, ...)
Version	gl.VERSION	WebGL 2.0 (OpenGL ES 3.0 Chromium)
Shading language	gl.SHADING_LANGUAGE_VERSION	WebGL GLSL ES 3.00
Extensions	gl.getSupportedExtensions()	30-50 extensions per browser
Max texture size	gl.MAX_TEXTURE_SIZE	16384
Max viewport dims	gl.MAX_VIEWPORT_DIMS	[16384, 16384]
Max anisotropy	EXT_texture_filter_anisotropic	16
Antialias	gl.getContextAttributes()	true
Max cube map texture	gl.MAX_CUBE_MAP_TEXTURE_SIZE	16384
Max renderbuffer	gl.MAX_RENDERBUFFER_SIZE	16384
Max fragment uniforms	gl.MAX_FRAGMENT_UNIFORM_VECTORS	1024
Max vertex uniforms	gl.MAX_VERTEX_UNIFORM_VECTORS	4096
Max vertex attribs	gl.MAX_VERTEX_ATTRIBS	16
Max varying vectors	gl.MAX_VARYING_VECTORS	30
Max texture units	gl.MAX_TEXTURE_IMAGE_UNITS	16
Aliased line width	gl.ALIASED_LINE_WIDTH_RANGE	[1, 1]
Aliased point size	gl.ALIASED_POINT_SIZE_RANGE	[1, 511]

Why it's high-entropy

The renderer string alone is highly unique. Examples across devices:

• ANGLE (Apple, ANGLE Metal Renderer: Apple M4, Unspecified Version)
• ANGLE (NVIDIA, NVIDIA GeForce RTX 4090, OpenGL 4.5)
• ANGLE (Intel, Intel(R) UHD Graphics 630, OpenGL 4.5)
• Mali-G78 (Android)
• Adreno (TM) 730 (Android)

Combined with 15+ numeric parameters that have different values per GPU model, WebGL produces ~12 bits of entropy.

Entropy and stability

Property	Value
Entropy	~12 bits
Stability	0.95
Typical duration	4-7ms

WebGL is the most stable collector. The renderer, vendor, and hardware limits don't change unless the user swaps their GPU or updates graphics drivers.

Role in cross-browser ID

WebGL data is used in the crossBrowserId calculation, but with normalization:

• ANGLE wrapper strings are stripped to extract the real chip name
• Only vendor, renderer, and maxTextureSize are used (not extensions, which vary per browser)

This normalization ensures Chrome's ANGLE (Apple, ANGLE Metal Renderer: Apple M4, ...) and Safari's Apple GPU both resolve to the same hardware identity.

Role in anti-detect detection

WebGL parameters are key to detecting anti-detect browsers:

• Parameter inconsistency: Spoofed renderer says "Intel HD Graphics" but maxTextureSize is 32768 (too high for Intel integrated)
• Platform mismatch: Platform claims macOS but renderer string contains d3d (DirectX, Windows-only)
• Mobile GPU with desktop params: Renderer says "Adreno" but parameters match a desktop GPU

Usage

const fp = await neoprint.get({ collectors: ['webgl'] })
const webgl = fp.components.webgl.value

console.log(webgl.vendor)          // GPU vendor
console.log(webgl.renderer)        // GPU model
console.log(webgl.extensions)      // supported WebGL extensions
console.log(webgl.maxTextureSize)  // hardware limit