Dead Pixel Test
Test your screen for dead pixels, stuck pixels, and hot pixels — full-screen solid color test for LCD, OLED, and all display types. No download required. Works on monitors, laptops, tablets, and phones.
Dead Pixel Test
Select a color to begin testing your screen for dead pixels, stuck pixels, and hot pixels.
📋 How to Test
Look carefully at each full-screen color. Any pixel that stays black on all colors is a dead pixel. A pixel stuck on a specific color (e.g., always red) is a stuck pixel. A pixel that is always white is a hot pixel.
Test Your Screen for Dead Pixels Online
This dead pixel test lets you check any display for defective pixels in seconds. Cycle through full-screen solid colors — red, green, blue, white, black, and gray — and look for pixels that don't match the background. Whether you just bought a new monitor, want to test a used laptop screen, or need to check for OLED pixel degradation, this online pixel checker provides a fast, accurate diagnosis without installing any software.
Can Dead Pixels Be Fixed?
Sometimes. It depends on what you are actually looking at, and the distinction matters more than most guides admit.
A dead pixel is permanently off. It renders black on every background because its transistor no longer receives power. Nothing you can install will bring it back — the pixel is not responding to a signal at all, so there is no signal to correct.
A stuck pixel is permanently on, or stuck on one color. It shows red, green, blue or white on backgrounds where it should be invisible, and it will often disappear when the screen changes. This one is frequently recoverable, because the pixel is still receiving power — it is just not switching.
Before you spend money on a repair, the honest first step is finding out which of the two you have. Run the color cycle test above and watch the suspect spot across all six backgrounds. Black on every color, including white: dead. Wrong color on some backgrounds, correct on others: stuck, and worth attempting a fix.
Software Fixes to Try First
Stuck pixel repair tools work on one principle: they cycle a single spot through rapidly changing colors to force the liquid crystal back into switching. Flash a small rectangle over the affected area at high speed for ten to thirty minutes and leave it running while you do something else. It costs nothing, it is non-invasive, and on a stuck pixel the success rate is high enough to be worth the wait.
If the pixel has not moved after a full session, try a physical approach. Turn the display off, apply light, steady pressure with a soft cloth directly over the spot, and turn it back on while holding for a few seconds. Do not press with anything hard and do not press on an OLED panel — this method belongs to LCD screens only.
What a Dead Pixel Checker Cannot Do
A tester tells you what your screen is doing. It does not repair the panel, and it does not decide whether your display qualifies for a warranty claim. That last part matters: most manufacturers set a minimum number of defective pixels before they will replace a monitor, and that threshold varies by brand and by resolution class. Check your warranty terms before you open a claim, and photograph the defect on a plain background — evidence taken with the test screen full-size is accepted far more often than a phone snapshot of a desktop.
If the defect is genuine but sits below your brand's replacement threshold, the next question is what the warranty actually covers. Our dead pixel warranty guide lists what each brand's pixel policy replaces and how to document a defect so a claim gets accepted.
Understanding Your Dead Pixel Test Results
The screen shows a uniform solid color with no anomalies. Your display has no dead pixels, stuck pixels, or hot pixels — it is in perfect condition.
A black dot that appears on all colors, especially white. The pixel transistor has failed and the pixel cannot light up. Dead pixels cannot be fixed.
A pixel that shows a fixed color (red, green, or blue) on every background. A sub-pixel is stuck in the "on" position. Stuck pixels may be fixable with pressure or pixel fixing tools.
A bright white dot that appears on the black test screen. The pixel transistor is stuck in the "on" position, causing it to be always lit. Hot pixels are a type of stuck pixel.
Why Use Our Dead Pixel Test
Test with pure red, green, blue, white, black, and gray — the standard colors for detecting all types of pixel defects on any display.
Enter any hex color code for a full-screen custom color test. Useful for testing specific color channels or creating your own test patterns.
Automatically cycles through all colors at your chosen speed (1-10 seconds per color). Sit back and watch for defects without manual switching.
Immersive fullscreen testing using the Fullscreen API. Eliminates browser chrome and distractions for a thorough pixel-by-pixel examination.
Works on LCD, LED, OLED, QLED, IPS, VA, TN, and Mini-LED panels. Test monitors, laptops, tablets, phones, and any screen with a web browser.
Test your phone or tablet screen for dead pixels too. The tool works on any device with a browser — just open this page and start testing.
All testing happens locally in your browser. No screenshots, no camera access, no data collection. The tool only changes background colors using CSS.
No installation, no plugins, no signup. Just open this dead pixel test and start checking your screen immediately — it works right in your browser.
After testing, get an AI-powered diagnostic summary with possible causes and recommended next steps — no more guessing what went wrong.
See a 0-100 health score and test coverage progress bar. Know exactly what percentage of the test you have completed and how healthy your device is.
Your test history is saved locally. When you test again, see if your device health improved or worsened — track wear and degradation over time.
Export your diagnostic report as PDF, copy a text summary, or generate a shareable URL. Perfect for warranty claims and tech support.
Switch colors instantly with keyboard-friendly controls. No loading, no processing — just pure solid colors displayed at full screen resolution.
When you test multiple devices, the tool correlates results across peripherals to surface shared failure patterns — ideal for isolating whether a problem stems from the device or the system.
Based on your test results, the tool suggests targeted next steps — swapping USB ports, updating drivers, or inspecting specific hardware components — so you spend less time guessing.
Supported Scenarios & Limitations
Quickly check whether Dead Pixel Test is the right tool for your needs. The lists below show exactly what this browser-based tool can and cannot do.
Works With
- LCD / LED displays
- OLED displays (TVs, monitors, phones)
- IPS / TN / VA / QLED / Mini-LED panels
- Laptop screens (MacBook, Dell, HP, Lenovo)
- External monitors (all brands)
- TVs (used as monitors or via built-in browser)
- Mobile phones and tablets
- Full-screen solid color tests (red, green, blue, white, black)
- Dead pixel, stuck pixel, and hot pixel detection
- Fullscreen mode for thorough inspection
Not Supported
- Repair or fix dead pixels (permanently black)
- Fix stuck pixels (use pixel fixer tools instead)
- Detect backlight bleeding (use dedicated tools)
- Measure screen burn-in severity
- Repair or replace damaged screen panels
- Test screens that are powered off or disconnected
Dead Pixel Test only verifies whether input events reach the browser. It cannot determine whether a failure is caused by hardware, drivers, firmware, or the operating system.
How Our Dead Pixel Test Works
Our dead pixel test uses the CSS background-color property and the Fullscreen API to display solid colors at full screen. This is the simplest and most reliable method for pixel testing — no complex rendering, just pure color output.
Solid Color Full-Screen Display
When you select a color or click "Start Test", the tool displays a full-screen element with the selected color as its background. In fullscreen mode, this covers the entire display, eliminating any UI distractions. Each preset color is a pure primary or composite color (e.g., pure red is #FF0000, pure white is #FFFFFF), which is essential for identifying specific sub-pixel defects.
Dead vs Stuck vs Hot Pixel Detection
Different pixel defects are visible on different colors: dead pixels (permanently off) appear as black dots on the white and gray screens. Stuck pixels (a sub-pixel stuck on) are visible as colored dots on contrasting backgrounds — a stuck red sub-pixel appears as a red dot on the green and blue screens. Hot pixels (always white) are most visible on the black screen. By cycling through all colors, you can identify the exact type and location of any defect.
Limitations
While our dead pixel test is highly effective, there are a few things to note: (1) Dust on the screen can be mistaken for dead pixels — always clean your screen before testing. (2) Some browser extensions or OS-level color calibration may affect the displayed colors. For the purest colors, disable any color management software. (3) The test only identifies pixel defects — it cannot fix them. For stuck pixel repair, try gentle pressure or a dedicated pixel fixer tool.
How to Check for Dead Pixels Properly
A proper dead pixel check takes about two minutes and does not need any software installed. You need the screen at full size, at its native resolution, with no browser chrome covering the edges.
Start with solid white. This is the most revealing background of all — a dead pixel on white is a black dot, easy to spot, and stuck pixels that hide on darker colors usually show up here too. Check the corners and the edges of the panel first, because that is where defects are most common and where people look last. Then run through black, red, green and blue in the same way.
The room matters more than you would expect. Work in dim light, clean the screen first with a dry microfiber cloth, and look from directly in front rather than at an angle. Dust and dried fingerprints produce dark specks that look exactly like dead pixels, and a full screen white test will show every one of them.
Dead Pixels on a White Background
White is the background to use when you only have time for one pass. On a solid white field, a dead pixel reads as a sharp black point with no glow or halo around it — dust tends to look softer at the edges, and a speck of debris moves when you wipe the screen. If you see a black dot on white that survives a cleaning, that pixel is not toggling.
Also worth knowing: a bright dot on white is not a dead pixel. It is either a stuck pixel or a hot pixel, and the two behave differently over time. A hot pixel usually stays bright on every background including black. A stuck pixel often corrects itself.
Screen, Monitor and Laptop Screens
The method above works on any panel, but the failure patterns differ by type. Desktop monitors and laptop panels are the most common sources of dead pixels simply because they are the panels people keep for years. Phone screens rarely develop a single dead pixel in isolation — if a phone display shows a black dot or a colored spot, that is more often impact damage or a pressure mark, and it will usually sit alongside some discoloration in the surrounding area rather than appearing as one clean point.
On a monitor, always test at native resolution. Scaling the display can blend a defective pixel into its neighbours, and it makes a single dead pixel much harder to confirm.
Common Pixel Problems You Can Detect
⚫ Dead Pixels
Permanently black pixels that never light up. Caused by a failed transistor in the LCD panel. Dead pixels are visible as black dots on white, gray, and colored backgrounds. They cannot be repaired — the pixel element is physically damaged. If your monitor has dead pixels, check the manufacturer's warranty policy for replacement eligibility.
🎨 Stuck Pixels
A sub-pixel (red, green, or blue) that is stuck in the "on" position, showing a fixed color on every background. Unlike dead pixels, stuck pixels may be fixable — try gently massaging the area with a soft cloth, or use a pixel fixer tool that rapidly cycles colors. Stuck pixels are most visible on contrasting backgrounds (e.g., a stuck red pixel on a green screen).
⚪ Hot Pixels
A pixel that is always white or very bright, even on a black screen. This is a type of stuck pixel where the transistor is stuck in the "on" position. Hot pixels are most visible on the black test screen. Like stuck pixels, they may be fixable with pressure or pixel fixing software.
🔥 OLED Burn-In
On OLED displays, static images displayed for extended periods can cause permanent burn-in — a faint ghost image that persists even when the content changes. While not the same as dead pixels, burn-in afterimages can be spotted using the solid color tests. Look for faint outlines or shadows on the pure color screens. This page only shows the afterimage visually and cannot measure burn-in severity or separate temporary image retention from permanent burn-in. OLED burn-in is permanent and cannot be fixed.
🌈 Backlight Bleeding
While not a pixel defect, backlight bleeding is visible on the black test screen as light patches around the edges or corners of the display. This is common on IPS panels and is caused by backlight leakage. This page only gives a visual hint and cannot grade bleeding severity — for a dedicated uniformity check, use our screen bleeding test. Excessive bleeding can still be grounds for a warranty claim on new monitors.
Supported Display Types & Devices
Supported Operating Systems & Browsers
Privacy & Security
This dead pixel test is designed with privacy as the top priority. The tool works by simply changing the background color of a full-screen HTML element using CSS — no camera access, no screenshots, no image processing, and no data collection of any kind. No information about your display, screen resolution, or any pixel data is transmitted to any server.
The tool does not require any account, login, or personal information. You can verify this by opening your browser's Developer Tools (F12) → Network tab. During testing, no network requests are made — the tool is entirely self-contained in your browser.
Dead Pixel Test FAQ
What is a dead pixel and how do I test for it? ▼
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.
What is the best way to test for dead pixels? ▼
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.
What is the difference between a dead pixel, stuck pixel, and hot pixel? ▼
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.
Why do I see a pixel that changes color on different test colors? ▼
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.
Can dead pixels develop over time? ▼
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.
Can this dead pixel test fix stuck pixels? ▼
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.
Can it detect backlight bleeding or screen burn-in? ▼
Only as a visual hint, not a measurement. 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, results depend on room lighting, and it cannot grade bleeding severity — for a dedicated check use our screen bleeding test. 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 or distinguish mild image retention from permanent burn-in. For thorough backlight and burn-in inspection, use a dark room and inspect the edges and center of the display carefully.
Can it repair or replace a damaged screen panel? ▼
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.
Can I test my laptop screen for dead pixels? ▼
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.
Can I test for dead pixels on my iPhone or Android phone? ▼
Yes. It runs in the mobile browser on iPhone and Android — set brightness to maximum, open the white screen first, and look straight on. A phone is harder: the pixel pitch is small, so one dead pixel is a fraction of what you can resolve. For a new phone, use the phone; for a monitor, test the display itself.
Is there an online dead pixel test that needs no download? ▼
This page is it. Nothing to install, nothing to sign up for — the full screen color cycle runs in the browser on any device. It works the same on Windows, macOS, Android, and iOS, and the test is entirely local: the tool only changes background colors, so no data leaves your device.
What about a full screen test for dead pixels on a TV? ▼
Connect a laptop by HDMI, open the test, and set the TV to its native resolution with picture processing off. Overscan is the usual culprit when a TV test looks wrong: it crops the image edges, so the last rows and columns of pixels never get tested. Look for an aspect option labelled "just scan" or "screen fit".
Quick Summary
Dead Pixel Test is a free online tool that checks your screen for dead pixels, stuck pixels, and hot pixels using full-screen solid color tests. Cycle through pure red, green, blue, white, black, and gray backgrounds to identify any pixel defects on LCD, OLED, QLED, IPS, VA, and TN displays. The tool supports custom colors, auto-cycling, and fullscreen mode for thorough pixel-by-pixel examination. Whether you just bought a new monitor, are testing a used laptop, or checking for OLED burn-in afterimages, this pixel checker provides instant, privacy-first diagnostics — no download, no camera, and no data collection. Note: it shows burn-in and backlight-bleeding hints visually but cannot measure their severity. All testing happens locally in your browser. After testing, review your diagnostic summary with health score, trend tracking, and cross-device correlation analysis — all data stays in your browser.