Dead Pixel Test — Full Screen Color Test
A free full screen color test covering all 8 colors. Switch between them using keyboard shortcuts or swatches — the fastest monitor dead pixel checker and display diagnostic test online. No download, works on any browser.
Or press F11 · Mobile: double-tap
Switch Color
Keyboard: WWhite KBlack RRed GGreen ← → Cycle
Keyboard Shortcuts
Also: ← →Cycle through colors F11Toggle fullscreen ESC Exit fullscreen
Why You Need All 8 Colors to Test Your Monitor
No single color can reveal all types of display defects. Running this display test through all 8 colors gives you a complete screen diagnostic — covering dead pixels, stuck pixels, backlight bleed, and color channel accuracy in under 5 minutes. Each color targets a specific problem:
Individual Color Screen Test Pages
Frequently Asked Questions
How do I do a full monitor test?
Start with white to spot dead pixels quickly, then switch to black in a dark room to check for backlight bleed. Run through red, green, and blue to test each primary color channel. Finish with yellow, cyan, and magenta to catch stuck sub-pixels in each channel. The entire test takes under 5 minutes and covers all common display defects.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel is permanently black — the pixel is completely non-functional and appears as a dark spot on any background. A stuck pixel is always one color — usually red, green, or blue — because one sub-pixel is permanently on. Stuck pixels can sometimes be fixed with pixel-cycling software; dead pixels are permanent hardware failures.
How many dead pixels are acceptable?
Monitor manufacturers use ISO 13406-2 standards to classify defects. Most monitors allow a small number of defects before qualifying for warranty replacement. Class 1 (premium) monitors allow zero defects. Most consumer displays are Class 2, which permits up to 2 dead pixels and 5 stuck pixels per million pixels. Check your monitor's warranty policy for exact coverage.
Do I need to download anything to use this test?
No. This screen color test runs entirely in your browser — no downloads, no plugins, no sign-up required. It works on Windows, Mac, Linux, Chromebook, iOS, and Android. Just open the page, click fullscreen, and run through the colors.