Online Monitor & Display Test
A complete suite of free browser-based tests to help you check for dead pixels, color accuracy, backlight bleed, and other common display issues.
Solid Color Test
Check for dead, stuck, or lit pixels.
Gradient Test
Identify color banding issues.
Contrast Test
Check black & white level accuracy.
Screen Uniformity
Find backlight bleed & clouding.
Sharpness Test
Evaluate text clarity and sharpness.
Viewing Angle
Check for color shifting from angles.
Response Time
A simple test for ghosting artifacts.
Refresh Rate
A basic FPS counter for your display.
How to Get the Best Results
Follow these simple steps to perform a thorough and accurate check of your monitor.
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1. Prepare Your Environment
For best results, test in a dimly lit room to make issues like backlight bleed more obvious. Make sure your monitor is clean and free of dust or smudges.
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2. Use Fullscreen Mode
Our tests are designed to run in fullscreen. This hides distractions and allows you to inspect the very edges of your display for problems.
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3. Know What to Look For
In the solid color tests, look for tiny dots that are the wrong color (dead or stuck pixels). In the uniformity test, look for bright patches, especially near the edges (backlight bleed).
Frequently Asked Questions
A **dead pixel** is a pixel that remains unlit (black) at all times. This is typically a hardware defect that cannot be fixed. A **stuck pixel** is a pixel that is permanently stuck on one color (usually red, green, or blue) because one of its sub-pixels is always on. Stuck pixels can sometimes be fixed with software tools.
The best way to test for backlight bleed is to use the "Screen Uniformity" test. Select the black or dark gray color pattern, make your room as dark as possible, and increase your monitor's brightness. Look for patches of light "bleeding" in from the edges of the screen. This is most common on LCD/LED displays.
Yes, all tests except the "Screen Uniformity" test for backlight bleed are fully compatible with OLED displays. Since OLED pixels produce their own light, they do not have a backlight and therefore cannot suffer from backlight bleed or clouding. The dead pixel and color tests are still very useful for OLED screens.
It's simple. Use the buttons to cycle through the different test patterns. We recommend going full-screen (press F11) in a dark room. Carefully inspect the screen during each color test (Red, Green, Blue, White, Black) to find any dead or stuck pixels. Use the other patterns to check for uniformity, ghosting, and color banding.
This tool is primarily for *testing* and *finding* pixels. However, some users have success fixing stuck pixels by rapidly cycling through different colors. You can try our "Stuck Pixel Fixer" tool, which flashes high-contrast colors to try and "unstick" the pixel. This is not guaranteed to work and has no effect on dead pixels.
Ghosting (or motion blur) is a trail or "ghost" image left behind by moving objects on a screen. It's caused by a monitor's slow response time. Our "Ghosting Test" (often a UFO or moving box pattern) is designed to make this effect obvious. A high-refresh-rate monitor with a fast response time will show a much clearer moving image.
Yes, 100%. This tool is a simple web page that runs entirely in your browser. It does not install any software, and no data about your monitor or system is sent to our servers. It's completely safe and private to use.