Monitor contrast test

KeyboardTester.click

Open Source & Free Contrast Test

Free online monitor contrast test. Checkerboard pattern beside 50% gray reveals contrast and gamma issues. Works for LCD, LED, OLED and projector setups.

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Contrast Test

Squint or step back. Checkerboard average should equal solid gray.

You should see a perfect checkerboard with crisp boundaries between black and white squares. Squint slightly - the checkerboard average should appear as middle gray (RGB 128). If half-tones look uneven, your contrast is misconfigured.

Contrast Test guide

How to use the Contrast Test accurately

A monitor contrast test displays a fine black-and-white checkerboard next to a solid middle gray (RGB 128). When you squint or step back, the checkerboard's perceived average should match the gray.

01 What Is a Contrast Test? A monitor contrast test displays a fine black-and-white checkerboard next to a solid middle gray (RGB 128). When you squint or step back, the checkerboard's perceived average should match the gray.
02 How to Read the Result Checkerboard matches gray when squinted: Excellent contrast and gamma calibration.
03 Related Display Tests Brightness Test

Contrast Test FAQ

Common contrast test questions

Is this tool free to use?

Yes. The test runs in your browser with no account, download, or installation required.

Does the test upload my device data?

No. The live check is handled locally by the page wherever browser APIs allow it.

Why should I repeat the test?

Browser focus, permissions, wireless devices, and operating-system settings can affect a single run, so repeated tests give a clearer result.

Checklist

Display checks to confirm

  • What Is a Contrast Test? A monitor contrast test displays a fine black-and-white checkerboard next to a solid middle gray (RGB 128). When you squint or step back, the checkerboard's perceived average...
  • How to Read the Result Checkerboard matches gray when squinted: Excellent contrast and gamma calibration.
  • Related Display Tests Brightness Test

Windows app

KeyboardTester.click is available from Microsoft Store

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

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