Dead Pixel Test

First, make sure your screen is clean. No dead pixel test can automatically mark the dot that is a dead pixel, so you should do the test by carefully looking at the screen.

Tap / click · → / Space: next color · ←: previous · Esc: exit Controls: press H or press and hold the screen.

Which devices can you test?

Use this visual pixel test on a monitor, laptop, TV, tablet or phone with a web browser. Clean the display first and move the browser window to the screen you want to check before starting.

Inspect black, white, red, green, blue and gray backgrounds. Dark dots on light backgrounds may indicate dead pixels or subpixel defects; fixed bright or colored dots on black may indicate stuck pixels. Compare the same location across colors. This tool does not automatically detect or repair defects.

FAQ

How long does a dead pixel test take?

Most checks are completed in 1-3 minutes. If you notice a suspicious dot, repeat on multiple colors to confirm.

Can I run this test on a phone?

Yes. Open the test in your phone browser. If the browser does not support full screen, the test fills the page but browser bars may remain visible; areas covered by those bars are not checked.

How do I check each test color?

Tap or click the test surface, or press the right arrow or Space to advance. Use the left arrow to compare the previous color and Escape to exit. Controls disappear while you inspect the display; press H or hold the screen to show them again. Check the center and edges on each color before continuing.

Does a clean result mean the display has no defects?

This is a visual check for fixed dark, bright or colored dots. It does not measure color accuracy, touch response or hardware response time. If a dot remains suspicious, compare it on several backgrounds and consult your display manufacturer for diagnosis and its pixel policy.