What Is a GPU Tester?
A GPU tester identifies your graphics card and reports key display specifications - resolution, color depth, and an estimated fillrate - directly through your browser, without needing to open Device Manager, System Information, or any manufacturer software.
How to Use the GPU Tester
- Open this page - detection runs automatically.
- Your GPU renderer name appears at the top of the widget.
- Check resolution, color depth, and pixel ratio in the readouts below.
- The estimated fillrate gives a rough sense of how quickly your GPU can render pixels.
How It Works
This tool creates a WebGL context and queries the WEBGL_debug_renderer_info extension, which
most browsers expose to report the underlying graphics renderer string. Screen resolution and color depth
come from standard browser screen properties, and the fillrate estimate runs a short canvas
rendering benchmark to approximate how many pixels per second your GPU can draw.
Some browsers or privacy settings may partially mask the exact GPU model for fingerprinting protection - in that case, you may see a generic renderer name instead of your exact card model.
Understanding Your Results
- Renderer name shown clearly - your browser is reporting full GPU details.
- Generic name like "ANGLE" or "SwiftShader" - your browser may be using software rendering or masking hardware details for privacy; this doesn't necessarily mean your GPU isn't working.
- Resolution lower than expected - check your OS display scaling and resolution settings.
- Higher fillrate - generally indicates a more powerful GPU able to render more pixels per second.
Benefits
- Quickly confirm which GPU is actually active, especially on laptops with switchable graphics.
- Check your monitor's true resolution and color depth without digging through settings menus.
- No install required - works across Windows, macOS, and Linux.
Common Mistakes to Avoid
- Expecting an exact model number always - some browsers intentionally show a generic renderer string for privacy.
- Comparing fillrate numbers across different browsers - rendering paths differ enough between browsers that only same-browser comparisons are meaningful.
Frequently Asked Questions
Why does it show "Intel" instead of my dedicated GPU?
Laptops with switchable graphics sometimes run the browser on integrated graphics by default. Check your GPU control panel or OS graphics settings to assign your browser to the dedicated GPU if needed.
Is the fillrate number an official benchmark score?
No, it's a lightweight, browser-based estimate meant for relative comparison, not an official or standardized GPU benchmark result.
Why is my exact GPU model hidden?
Some browsers mask detailed GPU information by default as a privacy and fingerprinting-prevention measure, showing a generic renderer name instead of the specific card model.
Conclusion
This tool gives you a fast way to confirm your active GPU and display specs without digging through system settings. Pair it with the Refresh Rate Test and CPU Benchmark for a fuller system check.