Black Screen & Fullscreen Color Test

Fill your display with black, white, or ten other solid colors. Use these simple full-screen patterns for dark-room viewing, screen cleaning, and visual checks of uneven areas or possible pixel issues.

Dead Pixel Test & Monitor Checker

Easily detect dead or stuck pixels on your monitor with solid color backgrounds using our professional testing tool

Energy Saving

Save power on OLED screens where black pixels actually turn off completely

Multiple Colors

Test with black, white, green, blue, red, and purple screens instantly

No Installation

Free online tool that works directly in your browser - no downloads needed

Mobile Friendly

Works perfectly on all devices including phones, tablets, and computers

Instant Testing

Click any color to instantly enter fullscreen test mode

How to Run a Full-Screen Dead Pixel Test Online

Follow four quick steps to inspect every corner of your display for dead pixels, stuck pixels, color problems, and backlight bleed.

1

Choose Your Test Color

Select from twelve solid colors including primary (red, green, blue), secondary (cyan, magenta, yellow), and additional testing colors. Each color tests different display aspects.

2

Enter Fullscreen Mode

Click any color button to instantly fill your entire screen with that solid color. Works on all devices and browsers.

3

Check Your Screen

Carefully examine your display for dead pixels, stuck pixels, or uniformity issues. Look at all corners and edges.

4

Exit & Test Again

Press ESC or click anywhere to exit. Try different colors for comprehensive testing and best results.

How to Find Dead and Stuck Pixels on a Monitor

Dead pixels are manufacturing defects that appear as unchanging dots on your screen. Our professional free online dead pixel test and monitor checker makes detection easy and accurate. Use our black screen test and solid color backgrounds to spot these issues quickly before your warranty expires.

Identify Dead Pixels

Spots that remain black on colored backgrounds indicate dead pixels that need warranty replacement

Detect Stuck Pixels

Pixels that stay one color (red, green, or blue) regardless of what's displayed

Check Screen Uniformity

Solid colors reveal backlight bleeding, color gradients, and uniformity issues across your display

Black Screen Test for OLED and LCD Displays

OLED displays offer superior contrast and energy efficiency. Unlike LCD screens with constant backlights, OLED pixels emit their own light and turn completely off when displaying black. This makes our black screen test and dead pixel checker perfect for OLED monitors, smartphones, and TVs for accurate testing and energy savings.

Verify OLED Technology

True OLED screens show perfect blacks with no backlight glow - test in a dark room to confirm

Save Battery Life

Black pixels on OLED consume zero power, making our test useful for extending laptop and phone battery life

Prevent Burn-In

Regular full-color testing helps prevent OLED burn-in by exercising all pixels evenly

Free Monitor Test for Laptops, Phones, TVs, and Desktops

Our free online black screen test and dead pixel checker combines simplicity with professional-grade testing capabilities. Whether you're checking a new monitor purchase, diagnosing display issues with our monitor checker, or optimizing energy consumption, our tool delivers instant, reliable results.

No Installation Required

Runs directly in your browser - no downloads, no apps, no registration needed

Universal Compatibility

Works on Windows, Mac, Linux, iOS, Android - any device with a modern web browser

Instant Results

One-click testing with immediate fullscreen display - no waiting, no complex setup

Completely Free Forever

Professional-quality monitor testing available to everyone at no cost

What a Free Online Screen Test Can Check

Our Black Screen Test is a comprehensive free online monitor testing tool and dead pixel checker designed to help you test your display for dead pixels, screen uniformity issues, and color accuracy. Whether you're performing a black screen test, using the dead pixel test feature, checking a new monitor with our monitor checker, or diagnosing display problems, our professional tool provides instant, reliable results across all devices with 12 different test colors.

Save Energy with Our Black Screen Test

Using our black screen test saves energy, especially on modern OLED displays where black pixels actually turn off completely. This unique characteristic of OLED technology means that displaying a black screen consumes virtually no power for those pixels. Unlike traditional LCD screens that require a backlight regardless of what's displayed, OLED screens offer true blacks and significant energy savings. This makes our black screen test tool particularly valuable for laptop users and anyone conscious about power consumption while performing monitor checks.

Advanced Dead Pixel Test & Monitor Checker Features

Our black screen test makes it incredibly easy to spot dead or stuck pixels on your display using solid color backgrounds. Dead pixels appear as tiny dots that don't change color, while stuck pixels remain a specific color. Our professional free online dead pixel test and monitor checker provides perfect solid backgrounds in multiple colors to thoroughly test your monitor. Simply click any color button to enter fullscreen mode and carefully examine your entire screen with our monitor checker. This dead pixel test tool works on all devices and is particularly useful when purchasing a new display or diagnosing display issues with comprehensive black screen testing.

Monitor Checker - Verify Your OLED Screen

Use our black screen test and monitor checker to determine if your screen uses OLED technology. OLED screens don't emit any light when displaying pure black in our black screen test, as the pixels are completely off. If you notice that your black screen is truly black with no visible backlight glow during testing, especially in a dark room, you likely have an OLED display. LCD screens, on the other hand, will show some backlight bleeding even when displaying black. Our dead pixel test and monitor checker makes this verification easy and accurate.

Stealth Mode & Temporary Display Off

When you're in a dark room and need to temporarily switch off the display light, using a black screen can be more convenient than putting your device into standby mode. Your applications continue running in the background, and you can instantly resume where you left off with a simple click. This stealth mode functionality is perfect for presentations, watching content in dark environments, or any situation where you need quick access to your system without the distraction of a bright screen.

Fun & Practical Uses

Beyond technical testing, our screen test tool has numerous practical applications. Use it as a harmless prank to make friends think their device has died. The glossy black screen can serve as an impromptu mirror, helping you see who's behind you or check your appearance. It's also excellent for meditation - play your favorite meditation music while gazing at the calming solid colors. The black screen helps you see dust particles clearly, making screen cleaning easier without turning off your device completely.

Better Than Standby Mode

Our black screen tool offers most benefits of standby mode while keeping your apps running. Downloads continue, music plays in the background, and all your work remains active. This is particularly useful when you want to save power but need certain processes to continue running. Unlike standby mode, which may interrupt background tasks, our screen test allows everything to operate normally while reducing power consumption and screen wear.

12 Colors for Complete Monitor Checker Testing

While our black screen test is our specialty, we offer twelve different solid colors for comprehensive display testing and dead pixel detection. Primary colors (red, green, blue) test individual subpixels with our monitor checker. Secondary colors (cyan, magenta, yellow) check color mixing accuracy in the dead pixel test. Additional colors (orange, purple, brown, gray) help identify subtle display issues. White screens check backlight uniformity while our black screen test reveals dead pixels perfectly. Each color serves a specific purpose in thorough monitor testing, making this a complete free online black screen test and monitor checker solution.

How to Use Our Black Screen Test & Dead Pixel Checker

  1. Choose your desired test color from twelve options above for the black screen test or dead pixel checker (black, white, red, green, blue, yellow, orange, purple, magenta, cyan, gray, or brown)
  2. Click the color button to instantly enter fullscreen mode with that solid color for monitor checking
  3. Use the dead pixel test to examine your screen carefully for dead pixels, uniformity issues, or other display problems
  4. Click anywhere or press the ESC key to exit fullscreen and return to the monitor checker main page
  5. Test with multiple colors using our black screen test - primary colors reveal subpixel issues, while secondary colors check color mixing in the dead pixel test

Why Our Black Screen Test & Monitor Checker is the Best Choice

  • ✓Completely free black screen test and dead pixel checker with no registration or downloads required
  • ✓Professional monitor checker works on all devices - desktop computers, laptops, tablets, and smartphones
  • ✓Instant fullscreen black screen test with twelve different colors for comprehensive dead pixel detection
  • ✓Monitor checker compatible with all modern browsers including iOS Safari
  • ✓Prevents standby mode during black screen test for uninterrupted monitor checking
  • ✓Perfect for OLED testing, dead pixel test, and general monitor health checks with professional accuracy

Whether you're a professional seeking to verify monitor quality with our monitor checker, a consumer checking a new purchase with our dead pixel test, or simply someone who needs a black screen test, our comprehensive black screen test and dead pixel checker provides the most user-friendly free online monitor testing solution available. Bookmark this page for instant access whenever you need to perform a black screen test, run a dead pixel checker, test your display, or utilize any of our professional monitor checker features.