On-device browser diagnostics
Test your browser.
Check which modern web features your browser supports. See what works and what doesn't.
- No downloads
- No fingerprinting
- Runs locally in your browser
Takes ~5 seconds • Runs in your browser
All tests
Screen Tests
- Screen Size ComparisonCompare display dimensions, area, shape, and PPI
- Test for Dead Pixels on MonitorFind dead or stuck pixels with solid colors
- White Screen TestSpot dust, tint, and dark pixels
- Black Screen TestPure black and near-black fullscreen levels
- Backlight Bleed TestSeparate fixed light leaks from IPS glow
- Screen Uniformity TestCheck panel evenness on 50% gray
- White Brightness ScreenFullscreen pure, cool, neutral, or warm light
Speed & Graphics
Sound & Calls
- Test Stereo SoundCheck left, right, center, and frequency bands
- Call Quality TestCamera, mic, and WebRTC before a meeting
- HEVC TestReal H.265 playback plus codec hints
- Video Codec IdentifierInspect common video codec and container tags locally
- Video Bitrate CalculatorCalculate file size, bitrate, duration, and stream ceiling
- Notifications TestPermission status and a test notification
Something not working?
Step-by-step fixes for Chrome, Firefox, Safari, and Edge.
View troubleshooting guides