Tone range
Grayscale Test
A grayscale test for shadow and highlight detail: check tone steps, near-black uniformity and mid-tone tint.
Grayscale TestRuns locally · nothing is uploaded
Inspect shadow detail, highlight detail and smooth grayscale transitions.
- Start enters fullscreen — the pattern fills the whole screen with no other UI on it.
- Keyboard: ← previous · → / Space next · Esc finish. Touch: tap the left / right third of the surface, the middle to finish.
- Using more than one display? Run the test on each screen you want to check.
What this result means
Display Checkup records visual observations and browser estimates. It cannot certify hardware or decide whether a product must be returned. Compare anything concerning with the seller’s policy.
Related tests
Checks that usually pair well with this one.
Make it a full inspection
Run this test as part of a guided inspection and finish with a downloadable PDF report.
Frequently asked questions
Know the limits before you interpret a result.
Is this a hardware diagnostic?
No. Browser measurements are labeled as reported or estimated, and visual findings remain your own observation.
Does Display Checkup upload my screen data?
No. The tests and inspection record run in your browser. The report is generated locally.