Display · All tools
Inspect solid colors or gradients in fullscreen. Clean the screen first and compare suspicious spots across colors. Calculators require your actual resolution and physical diagonal.
DisplayDead Pixel Test: Inspect Your Screen
DisplayScreen Color Test: Fullscreen Color Patterns
DisplayMonitor Gradient Test: Check Visible Banding
DisplayBlack and White Level Test for Your Monitor
DisplayPPI Calculator: Calculate Screen Pixel Density
DisplayAspect Ratio Calculator
What this test can and cannot tell you
Results reflect events and signals available to your browser. Settings, permissions and device support can affect them; they do not certify that hardware is healthy or faulty.