Monitor Test: Screen Color and Pixels
Run a monitor test in seconds with full-screen patterns. Pick a solid color to look for dead or stuck pixels, a gradient to check for color banding, a checkerboard and line patterns to check sharpness and uniformity, or a moving box to look for ghosting and trailing. Click or press an arrow key to move through the patterns, and press Escape to leave. You judge the results with your own eyes, so the test works for any screen: a new monitor, a laptop, a TV or a phone. It runs entirely in your browser, with nothing to install.
Monitor Test
Full-screen color, gradient, line and motion patterns to check your display.
How to use the Monitor Test
- Press Start full-screen test, or choose a single pattern.
- Click, tap or press the Right arrow to see the next pattern, and Left to go back.
- Look for dots that stay a different color, uneven brightness, visible bands or smearing.
- Press Escape to leave the test.
Features
- Solid colors: black, white, red, green, blue and more
- Gradients to reveal banding
- Checkerboard and line sharpness patterns
- Moving box for ghosting and trailing
- Full-screen mode with keyboard control
- Free with nothing to install
Frequently asked questions
How do I test my monitor for dead pixels?
Start the full-screen test and look closely at the solid black, white, red, green and blue screens. A dead pixel stays dark or shows a fixed color on every screen.
What is color banding?
Banding shows as visible stripes in a smooth gradient. On a good display a gradient should look smooth, with no hard steps between shades.
What does the moving box test show?
If the moving box leaves a faint trail or smear behind it, the display has ghosting. A clean edge means the pixel response is good.
How do I exit full-screen mode?
Press the Escape key, or on a phone use the close button that appears when you tap the screen.
Does the test work on a phone or TV?
Yes. Open this page in the browser on the device you want to test and run the full-screen patterns there.