Dead Pixel Test

A dead pixel is a pixel on your display that no longer lights up — it appears as a permanently black dot regardless of what is shown on screen. To test for dead pixels, use our dead pixel test tool above: click "Start Test" and cycle through the full-screen solid colors (red, green, blue, white, black, gray). Look carefully at each color for any pixels that remain black. A dead pixel will appear as a black dot on all colors, including white. Dead pixels are caused by a failed transistor or damaged pixel element in the LCD or OLED panel.

For the most thorough dead pixel test, follow these steps: (1) Clean your screen with a microfiber cloth to remove dust that could be mistaken for dead pixels. (2) Dim the room lights or test in a dark room for best visibility. (3) Click "Start Test" and enable "Fullscreen" mode. (4) Cycle through each color slowly — spend at least 10-15 seconds on each color. (5) Get close to the screen and scan systematically from top to bottom, left to right. (6) Pay special attention to white and black screens — dead pixels are most visible on white, stuck pixels on black.

A dead pixel is permanently black — it does not light up at all, caused by a failed pixel transistor. A stuck pixel shows a fixed color (usually red, green, or blue) regardless of the image, caused by a sub-pixel that is stuck in the "on" position. A hot pixel is always white or very bright, caused by a stuck transistor in the "on" state. Our dead pixel test helps you identify all three types: dead pixels appear as black dots on white, stuck pixels show a fixed color on any background, and hot pixels appear as white dots on black.

If a pixel appears different on each test color but is not consistently black or white, it may be a partially stuck sub-pixel rather than a fully dead pixel. For example, if a pixel looks red on the green test but green on the red test, the blue and green sub-pixels may be partially stuck. These are often more fixable than fully dead pixels. Try the pressure method or a pixel fixer tool. Also, make sure the anomaly is actually on your screen and not dust or a smudge — clean the screen thoroughly before concluding it is a pixel defect.

Yes, dead pixels can develop over time, especially on older displays. LCD panels can develop dead pixels due to thermal stress, physical impact, or manufacturing defects that manifest after extended use. OLED displays are particularly susceptible to pixel degradation over time — individual organic pixels can wear out at different rates, leading to dead pixels or burn-in. If you notice a dead pixel appearing on an older monitor, run our test periodically to monitor whether more are developing. If the rate of new dead pixels increases, it may indicate a failing panel that needs replacement.

Not all dark spots on your screen are dead pixels. Common imposters include: (1) dust particles on the screen surface — clean with a microfiber cloth and retest. (2) Smudges or fingerprints — wipe gently with screen cleaner. (3) Insects or debris behind the screen glass (on edge-to-edge glass displays). (4) Pressure marks from cleaning too hard or closing the laptop with an object inside. (5) Dead pixels on a screen protector, not the actual screen. Always clean your screen thoroughly and remove any screen protector before running the dead pixel test to avoid false positives.

No. This tool only displays full-screen solid colors to help you identify dead, stuck, and hot pixels — it cannot repair them. However, stuck pixels can sometimes be fixed using other methods: (1) gentle pressure on the affected area while the monitor is off, (2) pixel fixing software that rapidly cycles colors, (3) JScreenFix which displays random noise on the affected area, or (4) simply waiting — some stuck pixels resolve on their own after a few days. Note: never apply excessive pressure as it can damage the panel further. Dead pixels (permanently black) cannot be fixed.

Partially. Our black and gray test screens can help you spot backlight bleeding (uneven light leakage around the edges of the screen, visible on black). However, the tool is not specifically designed for backlight bleeding detection, and results depend on room lighting. For screen burn-in (permanent ghost images on OLED), you can use the white or solid color screens to check for persistent afterimages, but our tool cannot measure burn-in severity. For thorough backlight and burn-in testing, use a dark room and inspect the edges and center of the display carefully.

No. This is a diagnostic tool, not a repair tool. It cannot repair dead pixels, replace a damaged panel, fix a cracked screen, or resolve manufacturing defects. What it can do is help you identify whether your screen has dead, stuck, or hot pixels so you can decide whether to seek warranty service, request a replacement from the retailer, or attempt stuck pixel repair methods. If your screen has significant pixel defects, contact the manufacturer or retailer — most have specific dead pixel policies.

Yes, our dead pixel test works on all display types — LCD, LED, OLED, QLED, IPS, VA, TN, and Mini-LED panels. The test displays full-screen solid colors, which will reveal dead pixels, stuck pixels, and hot pixels on any display technology. For OLED displays, dead pixel testing is especially important because individual OLED pixels can degrade at different rates, leading to burn-in or uneven wear over time. The test also works on laptop screens, external monitors, tablets, and phones.

Absolutely. Testing a laptop screen for dead pixels is one of the most common uses of this tool. Simply open this page in your laptop's browser, click "Start Test", and cycle through the colors. Look carefully at each full-screen color for any anomalies. If you just bought a new laptop, test it immediately — most retailers have a short return window for displays with dead pixels, even if the manufacturer's warranty doesn't cover a single dead pixel. Testing early gives you the best chance of getting a replacement.

Yes. This tool works on any device with a web browser and a screen. For TVs, open this page in the TV's built-in browser or cast from a connected device. For phones and tablets, open this page in the mobile browser and run the full-screen color test. Note that on mobile devices, the browser may not go fully fullscreen due to OS UI elements. For the best results on mobile, rotate to landscape orientation and use the fullscreen mode if available. Testing a new TV or phone for dead pixels immediately after purchase is highly recommended.

Yes. This tool works with OLED displays (including OLED TVs, OLED monitors, and OLED phone screens) and MacBook screens (including MacBook Air and MacBook Pro with Retina displays, Liquid Retina XDR, and mini-LED). OLED panels are especially important to test because individual organic pixels degrade at different rates over time. For MacBook screens, the high pixel density makes dead pixels harder to spot — get close to the screen and use the white and black test colors for the best visibility.

It depends on the manufacturer's dead pixel policy, which varies by brand. Most manufacturers consider a certain number of dead pixels as "within specification" and will not replace the monitor unless the count exceeds their threshold. For example, some brands require 3-5 dead pixels before offering a replacement, while others have a zero-dead-pixel guarantee for premium models. However, many retailers (like Amazon) have a 30-day return policy that covers even a single dead pixel. Always check your specific warranty terms and test your new monitor immediately after purchase.

Yes, our dead pixel test works on all operating systems — Windows, macOS, Linux, and ChromeOS — as long as you use a modern web browser (Chrome, Edge, Firefox, Safari, Opera). The test uses the Fullscreen API and CSS to display full-screen solid colors, which is universally supported. For the best results, use the fullscreen mode to ensure the entire screen is covered by the test color. The test also works on mobile browsers (Chrome for Android, Safari for iOS).

No. This dead pixel test is 100% privacy-friendly. All testing happens locally in your browser — the tool simply changes the background color of a full-screen element using CSS. No screenshots, display information, or any other data are sent to any server. The tool does not use your camera or take any images of your screen. You can verify this by checking your browser's network tab during testing.