How this test works
Uses the Fullscreen API and solid CSS color surfaces after your action.
User-confirmedPrecision label
P0 browser diagnostic
Dead Pixel / Screen Test
Cycle clean fullscreen colors for manual pixel and panel inspection.
User-confirmedBrowser-nativeLocal processing
PX
Interactive test
Dead pixels diagnostic
◆Stays on deviceNo raw hardware upload
Your data flow
No device permission, photo or screenshot is required.
Read the privacy overview →What this cannot prove
- The browser cannot detect physical pixel defects automatically.
- HDR and color management may alter patterns.
Fix common problems
- Clean the display surface before judging a spot.
- Check several solid colors.
- Compare dark-screen glow from different viewing angles.