Screen Test and Display Test: Check Any Monitor Online

A screen test fills your display with solid colors, gradients and moving patterns so you can spot defects with your own eyes. Start with the dead pixel test (about 30 seconds), then check backlight bleed on a black screen in a dark room, then ghosting and refresh rate if you game.

Every display test runs in your browser on a monitor, laptop, TV or phone, with no download or sign-up. Test a new screen inside its return window, because most stores and makers only swap a panel for defects reported early.

Updated 2026. Researched from published specifications and verified owner reviews; not professional advice.

Which screen test finds which problem
TestWhat it findsTimeMost useful for
Dead pixel testDead (always black), stuck (one color) and hot (always white) pixelsAbout 30 secondsEvery new or used screen
Backlight bleed testLight leaking at the edges, IPS glow, cloudingAbout 1 minuteLCD and IPS monitors, laptops, TVs
OLED burn-in testImage retention and permanent burn-in1 to 2 minutesOLED monitors, TVs and phones
Color accuracy testBanding, crushed blacks, tinted grays1 to 2 minutesPhoto and video work
Refresh rate testWhether the screen really runs at its advertised HzAbout 30 seconds144Hz and faster gaming monitors
Ghosting testMotion blur and trails behind moving objectsAbout 1 minuteGaming monitors and TVs

Times are typical for one pass. Run tests at native resolution with scaling off, full screen (F11), and brightness where you normally use it.

Free screen test and display test tools for any monitor, laptop, TV, or phone. Pick a test below to check your screen for dead pixels, ghosting, backlight bleed, color problems, and refresh rate. Every monitor test runs right in your browser, no download or sign-up needed.

Dead Pixel Test

Check your screen for dead or stuck pixels by cycling through solid colors

Start Test

OLED Burn-in Test

Detect image retention and burn-in on OLED displays

Start Test

Color Accuracy Test

Test color gradients, grayscale, and color reproduction quality

Start Test

Refresh Rate Test

Check your monitor's refresh rate and motion clarity

Start Test

Backlight Bleed Test

Detect light leakage and IPS glow on LCD monitors

Start Test

Ghosting Test

Track moving UFO targets to spot ghosting, motion blur, and overdrive artifacts

Start Test

What to test, and what to replace it with

These tools exist to tell you whether a screen is worth keeping. If it is not, these are the panels worth running the same tests on instead.

LG C4 65 in OLED evo LG C4 65 in OLED evo

The panel most of these test patterns are written against. OLED is where the dead-pixel and uniformity tests actually matter.

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Samsung S90F 65 in OLED Samsung S90F 65 in OLED

The main alternative to the C4 at the same size, and the one worth running the same tests on before you keep it.

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Calibrite Display Pro Colorimeter Calibrite Display Pro Colorimeter

Test patterns tell you something is wrong. A colorimeter tells you by how much, and fixes it.

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Dell UltraSharp U2722D Dell UltraSharp U2722D

The safe QHD desk monitor when a test turns up a panel you do not want to keep.

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As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Prices change, so check before buying.

How to Use Screen Tests

1

Choose Your Test

Select the appropriate test based on what you want to check on your monitor.

2

Enter Full Screen

Click the full screen button or press F11 for the best testing experience.

3

Follow Instructions

Each test will guide you through the process. Use spacebar or click to advance.

4

Check Results

Look for any abnormalities like dead pixels, color issues, or light bleeding.

Related Buying Guides

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Frequently Asked Questions

How do I test my screen?

Open a test above and press Start Test. Each test runs full screen in your browser with no download or sign-up. Press F11 for full screen, follow the on-screen prompts and look closely at the panel; most checks take under a minute on any monitor, laptop, TV or phone.

What is the best free display test to run first?

The dead pixel test. It cycles solid red, green, blue, black and white screens, so a pixel that stays black (dead) or stuck on one color is easy to see, and it is the defect makers are most likely to replace under a pixel policy.

How many dead pixels are acceptable on a new monitor?

It depends on the maker. The ISO 9241-307 standard defines pixel fault classes, and most consumer monitors are sold to a class that tolerates a few faulty pixels. Some brands replace a panel for a single bright pixel and others need several, so check the maker's pixel policy and report defects inside the return window.

Does this screen test work on laptops, TVs and phones?

Yes. It works in any modern browser, so you can run it on a laptop, a smart TV browser, a tablet or a phone. For a TV, open the page in the TV's browser or cast a laptop screen to it; see the laptop screen test and TV screen test for device-specific steps.

Is this display test free?

Yes. Every screen and display test on this site is free, runs in your browser and needs no account. Nothing is uploaded; the test simply draws colors and patterns on your screen.

More Free Screen and Display Tests