🖥️ Monitor Test

Dead pixel test, color accuracy, gradient, and response time test. Easily check your display quality.

Select Test

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Dead Pixel Test
Display solid colors in fullscreen to check always-on or always-off pixels.
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Color Accuracy Test
Check color reproduction with RGB gradients and representative color palettes.
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Gradient Banding Test
Detect color banding with a 256-level gradient.
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Response Speed Test
Visually test GtG response speed with moving bar ghosting.
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Display Info
Display resolution, pixel ratio, color depth, and refresh rate.

Usage and Application Examples

  • Check for dead pixels when buying a new monitor.
  • Check monitor calibration before creative work with the color accuracy test.
  • Visually confirm the difference between 8-bit and 10-bit panels with the gradient test.
  • Check gaming monitor ghosting with a response speed test.

What is Monitor Test?

Monitor Test is a comprehensive diagnostic utility that evaluates your display's performance across multiple parameters: dead pixel detection, color accuracy, gradient rendering, refresh rate responsiveness, and display specifications. Whether you're troubleshooting display problems, verifying newly purchased monitors, or assessing gaming hardware suitability, this tool provides detailed technical analysis. The test runs directly in your web browser, requiring no installation while providing results comparable to professional hardware testing equipment. Essential for identifying display defects, validating refresh rate claims, and ensuring color fidelity for creative work.

How to Use

Start the monitor test and proceed through individual diagnostic sections: • Dead Pixel Test displays solid colors filling your entire screen—carefully examine for stuck pixels that remain different colors
• Color Accuracy Test shows color gradients and reference swatches for comparison against known standards
• Gradient Banding Test reveals compression artifacts and color depth limitations through smooth transitions
• Response Time Test measures pixel transition speeds between colors
• Display Info section shows detected resolution, refresh rate, and panel technology. Run each test in a darkened room for dead pixel detection, allowing eyes to adjust for at least two minutes. For color tests, compare against calibrated reference monitors or professionally color-matched displays if available.

Use Cases

Retailers use Monitor Test to verify that replacement display stock meets specifications before selling to customers. Remote workers and content creators validate monitor color accuracy before professional work investments. Gamers verify refresh rate claims and response time characteristics before purchase decisions. IT departments implement Monitor Test in deployment procedures to identify defective units before installation. Students studying display technology and color science use it as an educational tool demonstrating practical concepts. Streamers and video producers use it to ensure display accuracy during setup, critical for content that requires color fidelity.

Tips & Insights

Dead pixel testing requires patience—spend at least 5-10 minutes on each color section, moving your eyes across the entire display systematically. Stuck pixels appear as dots of incorrect color and are distinct from dust particles, which cast shadows and move. Some pixels appear stuck due to temperature; allow displays to reach operating temperature before testing. Gradient banding indicates insufficient color depth; professional displays show smooth transitions while budget displays reveal color quantization. Understanding your monitor's specifications (native resolution, panel type, refresh rate) helps interpret test results—4K monitors naturally show different characteristics than 1080p displays due to pixel density differences.

Frequently Asked Questions

How do I use the dead pixel test?

Displays solid colors (red, green, blue, white, black) in sequence in fullscreen. Carefully observe the entire screen and check for any pixels that are always on or off. Click to switch to the next color, press ESC to exit.

Is it abnormal if I see banding in the gradient?

If you see banding in the gradient, your monitor's color depth may be limited to 8-bit or calibration may be needed. Monitors with 10-bit panels have less banding.

Is the refresh rate measurement accurate?

Since it's an estimate using requestAnimationFrame, there may be slight variations depending on your browser and OS settings. Check your monitor's specifications or OS settings for the exact value.

Can it be used on mobile devices?

Yes, it works on smartphones and tablets, but the dead pixel test and color accuracy test are most effective on a desktop monitor.

How do I interpret the response speed test?

A crisp, clear moving bar indicates fast monitor response speed. If you see much ghosting, it may indicate slower response time. Try changing the speed to compare.

What's the difference between stuck pixels and dead pixels?

Dead pixels are completely non-functional and appear as black dots that don't change color or brightness. Stuck pixels are functional but permanently display one color (usually red, green, or blue) regardless of the image. Dead pixels cannot be fixed, but stuck pixels can sometimes be revived using specialized pixel-fixing software or techniques, though results vary.

Can this monitor test detect all possible monitor problems?

This test covers common issues like dead pixels, color accuracy, and refresh rate, but cannot detect some problems like backlight uniformity issues, input lag, or hardware malfunctions. It's excellent for basic quality checks but shouldn't replace professional monitor calibration for critical color work. For comprehensive diagnostics, consider running multiple tests alongside this one and consulting your monitor's manual.

Why might color accuracy test results differ on different devices?

The color accuracy depends heavily on your graphics card, display driver, and browser rendering, not just the monitor itself. Different devices with different GPU capabilities and color profiles will produce varying results even on the same monitor. For the most accurate color testing, ensure both devices have identical color management settings and use the same browser.

How often should I run these monitor tests?

Running the tests once during initial monitor setup is recommended, then periodically (every 6-12 months) to check for new issues. If you notice visual problems like flicker or discoloration, test immediately to diagnose the cause. Professional users or those with high-end monitors might test more frequently to ensure consistent color accuracy and performance.

What screen resolution does this test require?

The test is designed to work on most modern resolutions from Full HD (1920x1080) and above, though it adapts to your display's native resolution. Very low resolutions below 1024x768 may not display all test patterns clearly due to limited pixels. For the most accurate results, run the test at your monitor's native resolution without any scaling applied.

Can I save or export the test results?

Most monitor test tools allow you to take screenshots of results, which you can save as image files for your records. Some implementations may not offer direct export functionality, but you can screenshot each test result and keep them organized in a folder. If you need to make a warranty claim, timestamped screenshots serve as documentation of any issues discovered.