Display test
Dead Pixel Test
Fill the screen with one flat color, then step to the next. A dead pixel, a stuck pixel, and a speck of dust do not behave the same way. This page only shows the fields. It does not count pixels or decide whether the panel should be returned.
Click the field for the next one. It stays until you click. Full screen is only that field. Space runs them. Esc leaves.
What the dead pixel test actually does
Twelve flat fields, one at a time
White, black, red, green, blue, cyan, magenta, yellow, orange, pink, purple, and mid gray. A defect that hides on white often shows on black or on one of the mixed colors.
A clean full screen
Full screen is only the color. Nothing else is drawn on it. Click once for the next color. The color stays until you click, so you can look at a dot.
Pause on the dot
The color stays put until you click it. Press Space if you want the fields to keep changing, and press Space again to hold the one that shows a speck.
No score and no upload
The page does not count pixels, send a photo, or decide a return. You look. The seller’s warranty rule is still the seller’s rule.
Dead pixel, stuck pixel, and dust
A dead pixel stays dark. On white it is a black or colored speck. On black it disappears, because it was already off. A stuck pixel stays lit. On black it is a bright red, green, blue, or white dot, and on the other fields it keeps the wrong color.
Dust, a fingerprint, and a mark on the glass move when you tilt the panel or wipe the outside. A pixel stays on the same pixel when the field changes. Wipe once before you start, then change color before you wipe again. If the speck vanishes when the color changes, it was not a dead pixel.
One subpixel can fail while the other two in that pixel still work. Red, green, and blue show that directly. Cyan, magenta, and yellow show the same failure from the other side, because each of those is two primaries with one missing. Orange, pink, and purple are the other solid colors on this site, so the same dot can be checked there too.
Gray is the extra field. Mid gray shows both a dark dead pixel and a bright stuck pixel more clearly than a strong primary. It is not a brightness measurement.
The solid color pages are the same fields without the cycle: the black screen, the white screen, and the red, green, and blue screens. Use those when you want one color and a download. Use this page when you want to step through them and stop on a suspicious spot.
How to run the dead pixel test
- Clean the glass once. Use a dry microfiber cloth on the outside of the panel. Do this before the first field, not after every color, or you will confuse a moving speck with a pixel.
- Open full screen. Press the badge on the color, or press F. The display is only that color. There is no button bar on it.
- Walk every field. Click the color, or press the right arrow, to go to the next field. Left arrow goes back. Do not stop at red, green, and blue. Cyan, magenta, and yellow show a single subpixel that those three can hide.
- Hold the field that shows the dot. Leave the color up. If Space is running the fields, press Space again to hold this one. Change color once more. A pixel stays put. Dust does not.
- Leave the test. Press Esc. On a phone, if the browser will not go full screen, the color covers this page and Close leaves it.
Why use this dead pixel test
The field is the whole panel
A photo of a white page still has text, a cursor, and a scrollbar. Those marks sit on top of the pixels you came to inspect. This dead pixel test paints one flat color from edge to edge, so a dark speck or a bright speck is the only thing that does not belong.
The controls get out of the way
Full screen is the color by itself. Click for the next color. The color stays until you click, so a dot is not moving while you look. Esc leaves. A bar on the field would cover the row you are trying to see.
Six fields, not one lucky color
White finds a pixel that stays dark. Black finds a pixel that stays lit. Red, green, and blue split that pixel into subpixels, so a single failed channel is not blended into a faint tint. Mid gray shows both kinds of dot without the glare of pure white.
Nothing is scored or uploaded
The page does not count dots, send a picture, or tell you the return will be accepted. You look, you note the color and the place, and the seller’s written pixel policy is still the rule that decides a claim.
What people use the dead pixel test for
A monitor that just came out of the box
Run it before the return window closes. Sit where you will actually sit, step through every field, and look at the center and the corners. If a dot stays on the same pixel when the color changes, you still have time to read the seller’s policy. The new monitor guide puts this check next to gray uniformity and corner light.
A used laptop or a second-hand display
Dust, a sticker shadow, and a real pixel can look the same in a shop photo. Wipe the glass once, then hold white and black. A mark that moves when you tilt the lid is on the glass. A mark that stays put is in the panel. This page does not tell you what the seller promised.
A phone or a tablet in the browser
Open the same dead pixel test on the device you are checking. Some mobile browsers refuse system full screen. The color then covers this page instead, and Close brings the article back. The fields are the same. A camera test, a battery test, and a speaker test are different jobs and are not on this page.
A TV with a browser, or a computer plugged into the TV
If the TV can show this page, the colors fill the panel the computer is driving. Set the computer to the resolution you will keep. A browser cannot change the TV’s firmware picture mode, and it cannot see a pixel that the TV’s own menu is covering. Exit the menu, then look.
What this page cannot decide
It cannot say how many bad pixels a warranty allows. That number is in the seller’s policy, and it is often different for the center and the edge. A page that flashes colors does not know which policy you bought under.
It cannot see a defect smaller than this browser can paint, and it cannot see one you are not looking at. Sit at the distance you actually use. An LCD changes color when you view it from a sharp angle, and that shift can hide or invent a speck.
It does not repair a stuck pixel. A flashing pattern is a different tool, and even that often does nothing. This page only shows the fields.
If the screen is new, do this before the return window closes. The new monitor guide puts this check next to uniformity and light leak. The monitor test walks the same colors in one sitting.
Frequently asked questions
How do I tell a dead pixel from a stuck pixel?
On white, a dead pixel stays dark and a stuck pixel is usually the wrong color. On black, a dead pixel disappears and a stuck pixel stays bright. Check both fields before you name it.
Why does the dot disappear when I change color?
A dead pixel is already black, so it vanishes on a black field. A speck of dust can also seem to vanish when the contrast changes. Wipe the glass and look again on white and on black.
Do I need red, green, and blue, or is white enough?
White finds many dark pixels. Black finds stuck pixels that stay lit. One primary finds a single subpixel that the white field blends into a faint tint. Use all of them if you are inside a return window.
Why is there a gray field?
Mid gray makes both a dark dot and a bright dot easier to see than a saturated primary. It is still just a flat color. It does not measure the panel.
The full screen still had buttons. Where did they go?
Full screen is only the color. There is no button bar on the field. Click the color for the next one. Esc leaves.
Can I trust a browser test for a warranty claim?
You can trust your eyes on these fields. The page does not produce a certificate. If you need a claim, note the color where the dot shows, where it sits on the panel, and the seller’s written pixel policy.
Does this work on a phone and on a monitor?
Yes. The same fields run in the browser. A phone may refuse system full screen. In that case the color covers this page, and Close leaves it. The pixel check is the same: a dot that stays put when the color changes.
Will this fix the pixel?
No. It only shows the field. Some stuck pixels clear on their own or after a long flashing cycle elsewhere. Many do not. Do not run a repair video on a screen you can still return if the dot is obvious.
How do I run a dead pixel test?
Clean the glass once, press the badge or F, and click through white, black, the primaries, cyan, magenta, yellow, and the other colors. The color stays until you click. Press Esc when you are done.
How do I test a dead pixel on an iPhone or Android phone?
Open this page in the phone’s browser and press Full screen. If the browser will not hide its own chrome, the color still covers this article and Close leaves it. Look at white for a dark dot and at black for a lit dot. This is not a test of the phone’s camera pixels.
How do I test a dead pixel on a TV?
Show this page on the TV, at the resolution you use, with the TV menu closed. Step through every color and look at the corners as well as the center. The page does not speak the TV’s remote, and it does not change the TV’s motion or brightness settings.
Is a dead pixel bad, and do dead pixels get worse?
A dead pixel stays off, and a stuck pixel stays on. One faint speck at the edge bothers some people and not others. This page cannot predict whether more will appear. If the screen is new, decide while you can still return it, using the seller’s policy, not a score from a website.
How common are dead pixels?
This site does not collect a count by brand, so it will not invent a rate. Panels are made of millions of pixels, and a few defective ones show up often enough that return windows exist. Look at your panel. A statistic from someone else’s visitors is not your screen.
Can I download a dead pixel test, or do I need an app?
No download and no app. The test is the color on this page. There is no result file to save, because the page did not measure anything. A program that flashes colors to try to unstick a pixel is a different tool, and this page does not do that.
Does a 4K or 1080p dead pixel test show a different picture?
The browser paints the color at the resolution the computer is already using. There is no separate 4K mode, 1440p mode, or 1080p file on this page. If the computer is not running the panel’s native resolution, set that in the system display settings first, then look again.
What about an OLED or AMOLED screen?
The same fields work. A dark dot on white can still be a dead pixel, and a bright dot on black can still be a stuck pixel. OLED has no backlight, so a bright corner on black is not backlight bleed. This page does not decide whether a leftover image is permanent burn-in.
