Monitor Test Online

Run simple browser-based monitor tests for color, sharpness, alignment, gradients and backlight issues.

Custom HEX

rgb

Brightness: 100%

High brightness can feel harsh in a dark room. Lower brightness if your eyes feel strained.

Shortcuts: F fullscreen, Esc exit fullscreen where supported, Space controls, 1-9 preset colors, arrow keys cycle test colors. In dead pixel fullscreen, tap to advance and swipe left or right to change colors.

Used Monitor Test Checklist

Checklist coming soon.

Quick answer

Run simple browser-based monitor tests for color, sharpness, alignment, gradients and backlight issues.

Summary

What it does	Run simple browser-based monitor tests for color, sharpness, alignment, gradients and backlight issues.
Best for	Lighting, focus, display checks or simple fullscreen use depending on the page.
Exit	Press Esc where supported or use the on-screen exit button.

How to test your monitor

Open each test pattern in fullscreen. Look for uneven color, bent grid lines, blurry text, banding or bright patches on dark screens.

Test one display at a time. If you use more than one monitor, move the browser window to the screen you want to check before entering fullscreen.

What each test checks

Solid color checks color uniformity. Gradients show banding. The grid checks alignment. Checkerboard helps reveal scaling issues. Text checks sharpness. The backlight screen helps reveal glow or bleed. Gray uniformity helps show tint and brightness changes.

These checks are visual. They can help you notice obvious problems, but they do not replace a colorimeter or repair test.

Color uniformity

A solid color should look even from edge to edge. Some small variation is normal, especially on large or older panels.

Grid and sharpness

The grid should look straight and evenly spaced. Text should look clear at your normal viewing distance and display scaling.

Backlight bleed check

Use the dark test in a dim room. Look for bright patches near edges or corners. Lower room reflections before judging the result.

Tool category

Browse more tools in Screen Tests.

White ScreenOpen a clean white screen for light, focus and cleaning.Black ScreenUse a black screen for low light, focus and display checks.Color ScreenPick any full-screen color with HEX or RGB controls.Dead Pixel TestCycle colors to inspect dead or stuck pixels.

What Is a White Screen Used For?Learn practical uses for a white screen, including light, video calls, cleaning, focus and monitor checks.How to Test a Monitor for Dead PixelsUse solid full-screen colors to check a monitor, phone or tablet for dead or stuck pixels.

FAQ

Is this a professional calibration tool?

No. It is a simple browser test for quick visual checks.

Does it work on external monitors?

Yes. Move your browser window to the display you want to test, then open fullscreen.