EXT_texture_compression_bptc

WebGL Extension

Both Fingerprinting Signal

What is EXT_texture_compression_bptc?

The EXT_texture_compression_bptc extension is part of the WebGL API and exposes 4 BPTC compressed texture formats (BC7 and BC6H in DirectX). Provides COMPRESSED_RGBA_BPTC_UNORM_EXT, COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT, COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT, and COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT. Each 4x4 block uses 128 bits. Available in both WebGL1 and WebGL2, but not supported on Windows.

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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