Test Your Monitor Color Accuracy Online
Free online tool for testing your monitor's color accuracy, gamma calibration, and contrast range. Includes pure color plates, gamma 2.2 verification, near-black and near-white contrast checks, RGB gradient banding detection, and a full 256-step grayscale ramp.
Verify gamma, contrast, and color depth with professional test patterns
Features
How to Test Your Monitor
Pick a test card — Color Plates, Gamma, Contrast, Gradients, or Grayscale.
Click the fullscreen button. Tests fill the entire screen for accurate evaluation.
Compare what you see against the reference descriptions. Navigate between tests with arrow keys or swipe.
Frequently Asked Questions
What is gamma 2.2 and why does it matter?
Gamma 2.2 is the standard brightness curve for most monitors and web content. If your display gamma is off, images will look too dark or washed out. The gamma test pattern helps you verify this without specialized hardware.
How many contrast squares should I see?
On a well-calibrated monitor, you should see all 10 dark squares (values 1–10) and all 10 bright squares (245–254). If you see fewer than 7 in either test, your monitor's contrast or brightness may need adjustment.
What causes color banding in gradients?
Banding appears as visible steps instead of smooth transitions. Common causes include 6-bit panels (displaying only 262K colors instead of 16.7M), aggressive compression in HDMI/DisplayPort settings, or incorrect color depth in your graphics driver.
Do I need to calibrate my monitor first?
No calibration is needed to run the test. This tool helps you evaluate your monitor's current state. If results are poor, you can then adjust brightness, contrast, and gamma in your monitor's OSD menu or use a hardware colorimeter for precise calibration.
Does this work on mobile devices?
Yes, the test works on phones and tablets. However, phone screens often have different gamma curves and adaptive brightness that may affect results. For the most accurate test, disable auto-brightness and use a desktop monitor.
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