WEBGL_compressed_texture_pvrtc

WebGL Extension

Both Fingerprinting Signal

What is WEBGL_compressed_texture_pvrtc?

The WEBGL_compressed_texture_pvrtc extension is part of the WebGL API and exposes four PVRTC compressed texture formats. Provides COMPRESSED_RGB_PVRTC_4BPPV1_IMG, COMPRESSED_RGBA_PVRTC_4BPPV1_IMG, COMPRESSED_RGB_PVRTC_2BPPV1_IMG, and COMPRESSED_RGBA_PVRTC_2BPPV1_IMG for reduced memory usage. Typically only available on mobile devices with PowerVR chipsets (iPhone, iPod Touch, iPad, and certain Android devices). Available in both WebGL1 and WebGL2, but named WEBKIT_WEBGL_compressed_texture_pvrtc on iOS devices.

Read MDN Documentation

Browser 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.

Learn About ASP Bypass

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