A screen test, display test, monitor test, or dead pixel test - the same six full-screen colors below cover all four names; click a color to fill the viewport and look for stuck or discolored pixels.
This tool draws a single solid color across the full viewport so dead, stuck, and discolored pixels stand out against a uniform background. Cycle through red, green, blue, black, white, and yellow to cover all six diagnostic colors.
Free Online Dead Pixel Test - Instantly Check Your LCD & OLED Screen Quality
Press any color tile above to start a full-screen color cycle - sweep red, green, blue, black, white, and yellow to spot stuck pixels, dead pixels, or backlight bleed. No install.
Also called a screen test, display test, panel test, or monitor test - the same full-screen color cycle covers all four names and works on LCD, OLED, and LED panels.
Wondering if your screen has dead pixels or other display issues? Use our free online dead pixel checker to quickly identify faulty pixels on LCD, OLED, or LED screens. With full-screen color testing, you can spot dead, stuck, or discolored pixels and verify your screen's resolution without any downloads. This screen/display test runs a full-screen color cycle so the pixel pattern is easy to spot.
Key features include:
- Quick Pixel Detection: Instantly identify dead or stuck pixels using full-screen color tests.
- Comprehensive Screen Check: Test colors across your entire screen to ensure display quality.
- Device Compatibility: Works across LCD, OLED, and LED screens - the same color cycle runs on every panel.
- Resolution Verification: Confirms your screen's resolution for optimal visual quality.
- Secure & Private: Entirely browser-based with no data storage or downloads.
Running a full pre-meeting hardware check? After the screen test, verify the rest of the input surface with the microphone test (level metering, permission check) and the camera test (resolution, preview). Together the three take under a minute and cover every hardware surface a typical video call depends on.
Going deeper on pixel defects? Read Dead pixel testing guide for the dead-vs-stuck-vs-hot taxonomy and the warranty-return threshold most manufacturers apply, and How to test for dead pixels before returning a monitor for the evidence pack (screenshots, pixel counts, test conditions) that speeds up an RMA.
Screen test passed today, but the laptop travels with you? Read Device test checklist for remote work for the schedule that catches new dead pixels, backlight bleed, or a loose display cable on a regular cadence rather than only at warranty-claim time. Pairs the screen check with mic, webcam, and keyboard tests in one 90-second sweep.
Spot key issues alongside the screen issues? Run a keyboard test to confirm every key registers - non-working keys are easier to surface in the same browser session as the screen check, and the keyboard test takes under thirty seconds.
Searched a different name for the same check? Read Screen / display test synonyms for what each name (screen test, display test, panel test, monitor test) actually covers, and What an LCD test does (and when to run one) for the underlying pixel check explained in plain terms - both pair with the colour cycle above so you know whether the right tool is open for the question you typed in.
Wondering whether to install a native app instead? Read Screen test online vs app - which is more accurate for the side-by-side: panel-level defects (dead pixels, uniformity, bleed) read the same in both; refresh-rate, 10-bit / HDR, and ICC color profile checks need a native app because the browser abstracts those signals away.
Searched for "test lcd" / "lcd tester" / "lcd test online" and not sure which tool fits your job? Read Test LCD: Pick the Right Screen-Test Tool - the disambiguation guide that maps each query phrasing to the right tool (panel pixels vs touch surface vs camera vs microphone) in one decision table.
How to Use the Free Dead Pixel Checker
Using the dead pixel test is simple. Follow these steps:
- Open the Tool: Access the dead pixel checker in your browser.
- Cycle Through Colors: Begin the test and inspect each color screen for pixel anomalies.
- Spot Dead Pixels: Look for black spots on bright colors or pixels stuck on specific colors.
- Verify Resolution: Ensure your screen's resolution is set optimally for better visual experience.
Why Test LCD and OLED Screens with Our Tool?
Testing your screen quality with our tool is an effective way to:
- Detect Dead and Stuck Pixels: Spot issues early to maintain a high-quality display.
- Ensure Display Quality: Keep your screen optimized for activities like streaming, gaming, and design work.
- Optimize Resolution Settings: Automatically checks resolution to prevent strain and enhance clarity.
- Universal Device Compatibility: Suitable for any screen type-LCD, OLED, or LED-across all devices.
Frequently Asked Questions
How does the dead pixel checker work?
The tool displays full-screen colors one by one to make dead pixels appear as black dots that don't change. Stuck pixels may stay on one color.
Is it safe to use this online dead pixel checker?
Yes, it's entirely safe. This tool only displays colors on your screen and does not alter settings or store data.
Can I test both LCD and OLED screens?
Yes. This tool supports LCD, OLED, and LED displays, allowing you to test any screen.
Will this tool work on mobile devices?
Yes! The test works on both desktop and mobile devices. Just open the tool in your mobile browser to check your screen.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel is permanently black regardless of the colour field - the transistor has failed. A stuck pixel shows one colour (usually red, green, or blue) because one sub-pixel is permanently on. Dead pixels are usually grounds for a warranty return; stuck pixels sometimes respond to pixel-massage or colour-cycling techniques.
How many dead pixels do I need for a warranty return?
Policies vary by manufacturer. Premium monitors (Apple Studio Display, Dell UltraSharp) typically have a zero-defect guarantee. Budget panels often require three or more dead pixels within a specified region before accepting a return. See our guide on testing before return for the full list.
Can this tool fix stuck pixels?
The tool cannot fix pixels directly, but running the colour cycle rapidly for several hours can sometimes unstick a pixel by exercising the liquid crystal. Success rate is around 30-40% on stuck (not dead) pixels. For a guaranteed fix, warranty replacement is the reliable path.
Does this test work on OLED displays, and is OLED burn-in a dead pixel?
The test works on OLED - the solid-colour screens expose uniform-brightness issues the same way. OLED burn-in is not a dead pixel: a burned-in pixel still changes colour, it simply drifts toward the image it retained longest (Slack sidebar, Chrome tab row, menu bar). To spot burn-in, compare the grey and white screens against a phone camera held close - afterimages show up as faint patterns that follow your apps' UI chrome.
Why do some "dead" pixels look alive on my Retina / high-DPI display?
A subpixel defect on a 4K or Retina panel is roughly one-third the size of a defect on a 1080p panel, so a sub-pixel that is permanently off appears as a faint colour tint rather than a dot. Zoom your browser to 200%+ during the test, and use a magnifier or phone camera at close range to confirm. A single-subpixel defect rarely qualifies for warranty return on its own; pair this test with the return workflow guide to build the evidence pack manufacturers ask for.
Where can I run an LCD test online in my browser?
Run this LCD test online right here: tap each solid colour button to fill the screen (optionally enable full-screen mode), then inspect for dead pixels, stuck pixels, or backlight bleed - the same red, green, blue, black, white, and yellow cycle described in the steps above, with no download required.
Does this LCD tester work for laptop and desktop monitors?
Yes. Use it as an LCD tester on laptops and desktop monitors alike - maximize or full-screen the window so each colour covers the whole panel before you inspect.
Conclusion: Ensure Your LCD or OLED Screen is Performing at Its Best
If you suspect display issues like dead pixels, our free online dead pixel checker can help you identify and address potential problems quickly. Verify your screen's resolution, spot any pixel imperfections, and keep your device's display at optimal performance with this easy, browser-based tool.
Ready to check your screen quality? and ensure your display is in top condition!