Anti-detect

Graphics Layer

WebGL Fingerprinting: The GPU Identifier Trackers Love

WebGL reveals your GPU vendor/renderer, supported extensions, and capability limits. Combined with canvas and headers, it becomes a stable hardware signature that bot detection and fraud systems lean on.

Vendor & rendererExtensions entropyShader precision

How WebGL exposes you

  • Unmasked renderer via WEBGL_debug_renderer_info leaks the exact GPU model (e.g., NVIDIA RTX 3080 Laptop).
  • Extensions list (ANTIALIAS, WEBGL_lose_context, etc.) forms a high-entropy vector tied to drivers.
  • Capabilities like max texture size, varying vectors, and shader precision differ per GPU/driver stack.
  • Performance profiling (DrawnApart research) can distinguish GPUs in <200ms using timing side channels.

Signals fraud systems watch

  • Software renderers (SwiftShader/LLVMpipe) → headless/VM risk.
  • Mismatched GPU vs User-Agent/Client Hints (e.g., mobile UA + desktop GPU).
  • Inconsistent canvas hash vs WebGL renderer (spoofing but not aligned).

Legit uses

  • Detecting incompatible devices for WebGL-heavy apps.
  • Graphics capability gating for games/editors.
  • Anti-cheat / anti-bot telemetry.

Defense Playbook

  1. Standardize: Tor RFP and Firefox privacy.resistFingerprinting clamp WebGL to generic values and require permission prompts for readbacks.
  2. Spoof consistently: If you claim Intel UHD 620, return UHD 620-consistent limits, extensions, and canvas hash.
  3. Avoid software renderers: Headless/SwiftShader is a loud signal. Prefer GPU passthrough or real devices.
  4. Align with headers & fonts: GPU model should match OS reported in UA/Client Hints and available fonts.
Run the WebGL Fingerprint Test then compare with your Canvas and Headers results. Consistency beats randomness for production anti-detect setups.

GPU Consistency Checklist

  • Renderer string matches OS/UA (no RTX 4090 on iPhone UA).
  • Canvas hash aligns with WebGL vendor (same GPU family).
  • Client Hints (Sec-CH-UA-Platform, model) not contradicting GPU.
  • No missing critical extensions (OES_texture_float) for claimed GPU class.
  • Stability across reloads; avoid per-request randomization unless all vectors randomize.

Check your WebGL fingerprint now

Get vendor/renderer, extensions, shader precision, and hash instantly.

Run WebGL TestFull Tool Suite