Free Online White Level Test - Clipped Highlights Detector

White Level Test

Count visible patches 223-254 on white background. All visible = healthy. Missing high = clipped highlights.

Look for the gray patches on the white background. You should see all patches labeled 223 through 254. If high values (250-254) blend into white, your monitor is clipping highlights - reduce contrast or check the OSD.

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White Level Test guide

How to use the White Level Test accurately

A white level test (or clipped highlights test) checks whether your monitor distinguishes near-white shades from pure white. We display 32 patches at RGB values 223 through 254 on pure white. A correctly calibrated monitor shows all 32.

01 What Is a White Level Test? A white level test (or clipped highlights test) checks whether your monitor distinguishes near-white shades from pure white. We display 32 patches at RGB values 223 through 254 on pure white.

02 How to Read Your Result All 32 visible: Excellent white level. Highlights are preserved.

03 How to Fix Clipped Whites Lower contrast in monitor OSD. Try 70-75% as a starting point.

04 Related Display Tests Black Level Test

white level test clipped highlights test near-white test monitor highlight test White Level Test Display

White Level Test FAQ

Common white level 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 White Level Test? A white level test (or clipped highlights test) checks whether your monitor distinguishes near-white shades from pure white.
How to Read Your Result All 32 visible: Excellent white level. Highlights are preserved.
How to Fix Clipped Whites Lower contrast in monitor OSD. Try 70-75% as a starting point.