What Is WebGL Vendor Spoofing?

WebGL Vendor Spoofing means altering the values that browsers expose through the WebGL API about your graphics hardware. When a script creates a WebGL context, it can query the vendor and renderer strings (e.g., “Intel”, “AMD Radeon”, “Apple GPU”). These values reveal information about your GPU, driver, and sometimes the device family.

By default, this data is available through the WEBGL_debug_renderer_info extension. Websites and fingerprinting scripts use it to create a GPU fingerprint. WebGL vendor spoofing modifies these strings so the hardware identity looks different, making the device harder to track.

Why WebGL Vendor Spoofing Matters for Fingerprinting

WebGL vendor and renderer strings are widely used in canvas fingerprinting and GPU fingerprinting. Here’s how sites exploit them:

• Identify the GPU and driver: Even if two devices run the same browser, different GPUs create unique outputs.
• Cross-check with other signals: If the WebGL vendor says “NVIDIA” but the User-Agent claims “iPhone Safari,” the mismatch is a red flag.
• Increase uniqueness: Rare GPU strings make a fingerprint stronger, linking sessions more reliably.

That’s why spoofing these values is important for stealth browsing and anti-tracking.

Challenges of WebGL Vendor Spoofing

• Consistency is key: Simply randomizing vendor/renderer strings often creates unrealistic pairings.
• Behavior still leaks: Changing strings doesn’t change how the GPU actually renders frames - rendering quirks can still reveal the truth.
• Detection engines look for mismatches: If the spoofed WebGL vendor doesn’t align with the rest of the profile (User-Agent, OS, screen resolution), the setup looks suspicious.

How Kameleo addresses it

Kameleo lets you spoof WebGL vendor and renderer values. To stay consistent, vendor values should match the browser kernel and OS - avoiding mismatches. Detailed guidance and API examples are available in our documentation.