Dead Pixel Test
Run a free online dead pixel test in full screen. Check a monitor, laptop, phone, tablet, or TV for dead, stuck, bright, and faulty pixels with solid colors.
Test color 1/6
White
Clean the display carefully and turn off any software that changes screen color. Dust and fingerprints can look like faulty pixels.
Before you start
Clean the display carefully and turn off any software that changes screen color. Dust and fingerprints can look like faulty pixels.
Move the pointer or tap once to show the controls.
Find pixel faults with a clean color test
Each full-screen color exposes a different subpixel problem. Use all six backgrounds before deciding whether a mark is dust, a dead pixel, or a stuck pixel.
What the colors reveal
White and gray
Make dead or dim pixels stand out as dark points on a bright field.
Black
Reveals pixels that remain bright when the rest of the panel is off.
Red, green, and blue
Help isolate a subpixel that cannot turn on or switch off correctly.
How this Dead Pixel Test works
The dead pixel test fills your display with one solid color at a time. A pixel contains red, green, and blue subpixels, and a fault may affect one channel or the whole pixel. Changing the background between white, black, red, green, blue, and gray creates strong contrast for each type of defect. A dead pixel often remains black on bright backgrounds. A stuck pixel may stay red, green, blue, or white when the surrounding color changes.
Clean the screen before you begin because dust can look exactly like a dark pixel. Start the test, enter full screen, and inspect the panel at a normal viewing distance. Move closer only when you notice a mark. Use the arrow buttons, arrow keys, or space bar to change colors. Check the center first, then scan each edge and corner in a steady pattern. Repeat any color if you are unsure. The test works on desktop monitors, laptop screens, tablets, phones, TVs with a browser, and OLED or LCD panels.
This tool helps you find and locate pixel faults; it does not repair them. Do not press, rub, or tap the panel, as pressure can cause further damage. A screenshot cannot record a physical pixel defect, so use a camera if you need evidence for a return. Pixel policies differ between manufacturers and may depend on the number, color, and position of faulty pixels. Review the warranty terms before arranging service. Everything runs in your browser, with no image capture or upload.
How to use this Dead Pixel Test
Clean the display
Remove dust and fingerprints so they are not mistaken for pixel faults.
Cycle through colors
Start full screen and inspect white, black, red, green, blue, and gray.
Confirm the same spot
A faulty pixel stays in one physical location while the background changes.
Frequently Asked Questions
How do I use this dead pixel test?
What does a dead pixel look like?
What is the difference between a dead pixel and a stuck pixel?
Which screen colors are best for finding dead pixels?
Can this test check OLED, laptop, phone, and TV screens?
Can an online dead pixel test repair a faulty pixel?
Should I press or rub a stuck pixel?
Why does the dot not appear in a screenshot?
How many dead pixels are acceptable on a new monitor?
Do dead pixels spread across the screen?
Related Tools
Color Contrast Checker
Check color contrast ratios between text and backgrounds. Ensure your design meets WCAG accessibility standards.
LCD Screen Bleed Test
Run a full-screen LCD screen bleed test with black and dark backgrounds. Check monitors, laptops, and TVs for backlight bleed, edge glow, and cloudy bright areas.
Webcam Test
Test your webcam online for free. Check live video preview, resolution, frame rate, and aspect ratio. Take a snapshot and download it as PNG — no upload needed.
Screen Uniformity Test
Run a full-screen screen uniformity test with gray and white backgrounds. Check monitors, laptops, and TVs for dirty screen effect, clouding, banding, and color tint.
Touch Screen Test
Test your touch screen online. Trace the grid to find dead zones, count multi-touch points, and check for ghost touches on phones, tablets, and laptops.
Online Keyboard Test
Test every key on your keyboard for stuck keys, dead keys, and ghosting. Press keys and see them light up on a live on-screen keyboard.
The Dead Pixel Test is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.
