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WEBGL_debug_renderer_info
WebGL Extension
Both
Fingerprinting Signal
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What is WEBGL_debug_renderer_info?
The WEBGL_debug_renderer_info extension is part of the WebGL API and exposes two constants with information about the GPU: UNMASKED_VENDOR_WEBGL returns the vendor string, and UNMASKED_RENDERER_WEBGL returns the renderer string. This can be used for debugging, but also poses a privacy/fingerprinting risk. Use with getParameter(). Available in both WebGL1 and WebGL2.
Read MDN DocumentationBrowser Support
Checking Extension Support
This extension is part of the Both specification.
Browser support varies based on:
- Graphics card model and capabilities
- GPU driver version
- Browser version and vendor
- Operating system
Usage in Web Scraping & Anti-Bot Bypass
Modern anti-bot systems verify WebGL extensions to detect automated browsers. Mismatches between GPU hardware and available extensions are strong bot signals.
What Anti-Bot Systems Check:
- Extension availability: Does the reported GPU support these extensions?
- Extension combinations: Are the extensions typical for this GPU model?
- Consistency checks: Do reported extensions match other GPU signals?
- Missing extensions: Are expected extensions for this GPU absent?
Scrapfly's Anti-Scraping Protection (ASP)
Scrapfly automatically manages WebGL fingerprint consistency, ensuring all extensions
match the emulated GPU profile. This prevents detection by anti-bot systems that verify WebGL data.
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