Dead Pixel & Monitor Test
Run your screen through fullscreen solid colors and gradients to find dead pixels, stuck pixels, backlight bleed and uniformity problems. Click anywhere (or press →) to move to the next screen, and Esc to exit — or use auto-cycle and just watch the screen. Fast auto-cycling is also the classic technique for trying to revive a stuck pixel.
The test cycles through these screens, fullscreen:
Tip: clean your screen first — dust is the most common “dead pixel”.
Found a pixel that stays lit or black? How to fix a stuck pixel →
How this monitor test works
Each pixel on an LCD or OLED panel is made of red, green and blue subpixels. Filling the screen with a single pure color drives one set of subpixels at a time, so a subpixel that is dead (always off) or stuck (always on) stands out as a dot of the wrong color. The gray and gradient screens reveal problems a single color cannot: uneven backlighting, tinted patches and color banding.
Frequently asked questions
What is the difference between a dead pixel and a stuck pixel?
A dead pixel receives no power and stays black — easiest to spot on the white screen. A stuck pixel is locked on one color and shows as a bright dot on the black screen or on the single-color screens. Stuck pixels sometimes recover; dead pixels usually do not.
How do I check for backlight bleed?
Use the black screen in a dark room at normal brightness. Glow along edges or in corners is backlight bleed. Some bleed is normal on LCD panels; large bright patches on a new monitor may justify a warranty claim.
What should I look for on the gray and gradient screens?
On 50% gray, look for patches that are brighter, darker or tinted — panel uniformity issues. On the gradients, look for visible stripes instead of a smooth ramp, which indicates color banding.
Can a stuck pixel be fixed?
Sometimes. Rapidly cycling colors over the pixel or applying gentle pressure with a soft cloth while the panel changes colors can revive a stuck pixel. Results vary, and pressure carries some risk — apply it sparingly.