How to test a screen
Start with black, white, red, green, and blue screens, then check grayscale, gradients, uniformity, contrast, sharpness, motion, and refresh-rate information. Use fullscreen for the most useful visual check.
Device tools
Screen Test
Check dead pixels, color, grayscale, contrast, sharpness, refresh rate, ghosting, touch area, and screen information in your browser.
Current modeQuick check
Current modeQuick check
Measured FPS--
Estimated refresh rate--
Frame time--
CSS size--
Estimated physical pixels--
Viewport--
Device pixel ratio--
Touch coverage0%
What this tool can find
It can help you notice stuck pixels, bright or dark pixels, backlight bleed, uneven brightness, color banding, ghosting, rough sharpness issues, and touch-area gaps.
Limits and safety
A web page cannot repair burn-in, replace a hardware diagnostic, or prove a panel is perfect. Avoid long maximum-brightness tests and do not use fast flashing patterns if you are photosensitive.
Privacy
All tests run in your browser. No screen result or device detail is uploaded.
FAQ
How do I check dead pixels?
Use solid black, white, red, green, and blue screens and look closely for pixels that stay a different color.
What is a bright dot on a black screen?
It may be a stuck or bright pixel, or backlight bleed on LCD panels. Retest in a dark room and compare several colors.
Can this page measure refresh rate exactly?
No. It estimates timing through the browser, so power saving, browser limits, and variable refresh rate can affect the result.
Can a web page fix OLED burn-in?
No. This tool can help reveal image retention or burn-in, but it cannot repair panel wear.
Is my test data uploaded?
No. The tests run in your browser and do not upload display information.