Question 1

How do I check for dead pixels on my monitor?

Accepted Answer

Use the dead pixel test to display solid color screens (red, green, blue, white, black). Go fullscreen and carefully examine every area of your screen. Dead pixels appear as tiny dots that don't match the background color. Stuck pixels show a constant color, while dead pixels appear black.

Question 2

How do I test my monitor's refresh rate?

Accepted Answer

The refresh rate test uses requestAnimationFrame to count actual rendered frames per second. For accurate results, ensure your OS display settings match your monitor's native refresh rate (60Hz, 144Hz, 240Hz, etc). Close other tabs and applications for best accuracy.

Question 3

What's the difference between dead and stuck pixels?

Accepted Answer

Dead pixels appear as black dots and are permanently non-functional. Stuck pixels display a constant color (red, green, or blue) and can sometimes be fixed using pixel-cycling videos or gentle pressure. Our color test screens help you identify both types.

Question 4

How do I test color accuracy?

Accepted Answer

The color test displays pure RGB values and gradients. Compare what you see against the expected colors. For professional color accuracy, you'll need a hardware colorimeter, but our test helps identify obvious color shifts, banding, and uniformity issues.

Question 5

Can I test response time?

Accepted Answer

Our response time test uses moving objects to help you visually assess motion blur and ghosting. Lower response times mean less blur. This is a visual test — precise millisecond measurements require specialized hardware like a pursuit camera.

Question 6

Does the test work on external monitors?

Accepted Answer

Yes! Open the test on the monitor you want to check and go fullscreen. Works with any display connected to your computer — external monitors, TVs, projectors, and portable displays via HDMI, DisplayPort, USB-C, or VGA.

Question 7

How do I test screen uniformity?

Accepted Answer

Display a solid gray or white screen in fullscreen mode. Look for brightness variations across the screen, especially in corners and edges. IPS glow, backlight bleed, and clouding are common uniformity issues visible on solid backgrounds.

Question 8

Why does my refresh rate test show lower than expected?

Accepted Answer

Common causes: V-Sync limiting to 60Hz, browser frame rate caps, power saving mode, incorrect display settings in your OS, or using the wrong cable (HDMI 1.4 caps at 60Hz for 4K). Check your display settings and ensure hardware acceleration is enabled in your browser.

Monitor Tester

Refresh Rate

Display Info

Dead Pixel Test

Color Gradient

Frequently Asked Questions