Free Online Monitor Brightness Test - 11-Step Calibration

Brightness Test

11 steps from black to white. All distinct = healthy. Merging steps = misconfigured.

You should see 11 distinct brightness steps from pure black on the left to pure white on the right. Each step should be visibly different from its neighbors. If steps in the middle look the same, your brightness or contrast is misconfigured.

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Brightness Test guide

How to use the Brightness Test accurately

A monitor brightness test displays a calibration ladder - 11 patches stepping evenly from pure black (0%) to pure white (100%). On a properly calibrated monitor, you should see 11 distinct steps with consistent visual spacing between each.

01 What Is a Brightness Test? A monitor brightness test displays a calibration ladder - 11 patches stepping evenly from pure black (0%) to pure white (100%).

02 How to Read Your Result 11 distinct steps: Excellent. Brightness/contrast properly set.

03 How to Set Brightness Correctly Match room lighting: Bright room = 250-350 nits. Dark room = 100-150 nits.

04 Related Display Tests Contrast Test

brightness test monitor brightness calibration grayscale ladder test display brightness check Brightness Test Display

Brightness Test FAQ

Common brightness 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 Brightness Test? A monitor brightness test displays a calibration ladder - 11 patches stepping evenly from pure black (0%) to pure white (100%).
How to Read Your Result 11 distinct steps: Excellent. Brightness/contrast properly set.
How to Set Brightness Correctly Match room lighting: Bright room = 250-350 nits. Dark room = 100-150 nits.