The All-in-One Online Screen Test
Worried about your new monitor? Use our free, easy-to-use dead pixel test to quickly check any screen for dead, stuck, or hot pixels. No installation needed.
Start Dead Pixel Test NowA Full Suite of Professional Screen Test Tools
Dead Pixel & Stuck Pixel Screen Test
Our core tool. Cycle through solid colors to easily spot dead, stuck, or hot pixels on your screen.
Test Now →Refresh Rate Test
Use the UFO test to verify your monitor's refresh rate (Hz) and check for screen tearing or stuttering.
Test Now →Backlight Bleed, IPS Glow & Clouding Test
A simple black screen test to reveal backlight bleed and clouding issues on LCD monitors.
Test Now →Ghosting Test
Check your monitor's response time and identify motion blur or "ghosting" with this test.
Test Now →Online Viewing Angle Test for Monitors
See how colors and contrast shift when viewing your screen from different angles.
Test Now →Text Clarity Test
Check for text sharpness and color fringing, crucial for reading and office work.
Test Now →Input Lag Test
Measure your total system reaction time, including monitor and mouse latency.
Test Now →Articles
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Tired of washed-out, dim HDR? Our expert guide reveals the hidden cost of budget HDR monitors and why they often look worse than SDR. Learn what to look for.
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Master USB-C monitor setup with our expert guide. Solve power delivery issues, cable compatibility problems, and achieve the perfect single-cable workspace setup.
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OLED Anxiety Relief: Practical Burn-In Prevention for Everyday Users
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The 8-Hour Screen Test: Which Monitor Tech *Actually* Reduces Eye Fatigue? (Flicker-Free, Low Blue Light Tested)
Feeling eye strain after a long day? Our expert 8-hour screen test reveals which monitor tech, like Flicker-Free and Low Blue Light, actually reduces eye fatigue.
Gaming Monitors
The Creator-Gamer's Guide: How to Balance Color Accuracy and High Refresh Rates on One Monitor
Torn between color accuracy for creative work and a high refresh rate for gaming? Our expert guide shows you how to find and set up one monitor that does both flawlessly.
Gaming Monitors
The 1440p Sweet Spot: Why This Resolution Dominates Real-World Gaming in 2025
Is 1440p still the gaming sweet spot in 2025? Our expert guide breaks down why QHD resolution offers the perfect balance of visual fidelity and high-refresh-rate performance.
Understanding the Dead Pixel Test
A dead pixel test is the most fundamental and important check for any new or used monitor. Pixel defects can be distracting and are often covered by manufacturer warranties. Our tool makes it easy to find these issues without any software installation.
What Are You Looking For?
When you run the dead pixel test, you are looking for any pixel that behaves abnormally. There are three main types of pixel defects:
- Dead Pixels: These are pixels where all three sub-pixels (red, green, and blue) are permanently off. They appear as a small black square and are the easiest to spot on a white or bright-colored background.
- Stuck Pixels: This occurs when one or two sub-pixels are permanently on. This results in a pixel that is stuck on a single color - red, green, blue, cyan, magenta, or yellow. A stuck pixel is best found by cycling through all the solid colors in our test.
- Hot Pixels: This is when all sub-pixels are permanently on, making the pixel always appear white. A hot pixel is most noticeable during the black screen portion of the dead pixel test.