Monitor color test tool showing fullscreen color panels for display calibration

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Free Monitor Color Test - Free Screen Color Check Online

Free open source monitor color test online. Check color accuracy, gradient banding, contrast and backlight uniformity on any screen. Fullscreen color panels. No download needed.

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Free Open Source Monitor Color Test

Cycle through 14 color panels to check color accuracy, gradient banding, backlight uniformity, and contrast.

Pure Black 1/14

Jump to a test:

Tip: Press F to go fullscreen, → / Space for next, ← for previous. Click anywhere on the panel to advance. For accurate results, dim room lighting and let your monitor warm up for 15 minutes.

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Monitor Color Test guide

How to use the Monitor Color Test accurately

Free open source monitor color test online. Check color accuracy, gradient banding, contrast and backlight uniformity on any screen. Fullscreen color panels. No download needed.

01 What to Look for During the Color Test Each test panel targets a specific display defect. Here is what to watch for on each one.
02 What Is Color Banding? Color banding occurs when a monitor cannot display smooth gradients, producing visible steps or stripes instead of a continuous transition.
03 Backlight Bleed vs IPS Glow Both appear during the Pure Black test but have different causes and different implications for your display.
04 Monitor Calibration After This Test If colors look inaccurate, these steps will help you improve display quality.

Related guide Dead Pixel Test: How to Check Your Monitor for Defective Pixels →

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Monitor Color Test FAQ

Common monitor color test questions

What does the monitor color test check?

It shows fullscreen solid colors, gradients, grayscale ramps, and checkerboards so you can inspect banding, tint, backlight uniformity, dead pixels, and color clipping.

How do I use the color panels?

Open fullscreen mode, cycle each panel, and inspect the display from your normal viewing angle. Use solid red, green, blue, white, and black for defects, then use gradients for banding.

What is color banding?

Banding is visible stepping in a gradient that should look smooth. It can come from a low-bit-depth panel, wrong color settings, compression, or an over-aggressive monitor mode.

Should I calibrate my monitor after this test?

If you see tint, clipped shadows, crushed highlights, or uneven gradients, check your OS display calibration, GPU color range, monitor picture mode, and cable settings.

Checklist

Display checks to confirm

  • What to Look for During the Color Test Each test panel targets a specific display defect. Here is what to watch for on each one.
  • What Is Color Banding? Color banding occurs when a monitor cannot display smooth gradients, producing visible steps or stripes instead of a continuous transition.
  • Backlight Bleed vs IPS Glow Both appear during the Pure Black test but have different causes and different implications for your display.

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Install the official Windows app shortcut, or keep using the same free testing tools in your browser.

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