Display Test

A free test page for desktop displays and monitors. Detects screen resolution and color depth, walks you through full-screen color test patterns, and helps you spot dead pixels or backlight issues. Useful before showing customer-facing content or validating a retail kiosk.

Read the Display Test guide for help reading the verdict or fixing each failure mode.

Privacy: All test patterns render in this browser tab. Screen metrics are read and displayed but never transmitted. Press Escape at any time to exit a full-screen overlay. View source to verify.

Configuration

Driver: Browser screen + matchMedia APIs

Takes about 60 seconds. All test patterns render locally; nothing is uploaded.

Status Check Step

Pending

Display capabilities are detected

Reading screen, window.devicePixelRatio, and matchMedia preferences.

1 of 3

Pending

Color reproduction looks correct

View full-screen solid colors, CMYK and RGB bars, and a grayscale gradient.

2 of 3

Click each pattern below to fill your screen with it. Press Esc or click anywhere to exit the overlay. After viewing, answer the questions below.

Did the colors look correct (solid red, green, blue, white, black all matched their names)?
Did the grayscale gradient look smooth (no visible bands or stripes)?

Pending

Dead pixel and uniformity check

Cycles through solid colors so you can spot stuck pixels and backlight problems.

3 of 3

Click Run dead-pixel scan. The screen cycles through red, green, blue, white, and black for about 2 seconds each. Watch for any pixel that stays a different color than the rest of the screen, or for dim or bright patches. Press Esc or click to exit at any time.

Did you see any dead or stuck pixels (single dots that did not change)?
Did the screen look uniform (no dim or bright patches across the surface)?