Resolution Checker

View browser-reported screen dimensions, viewport size and device pixel ratio.

Resolution CheckerRuns locally · nothing is uploaded

See the active screen, viewport, device pixel ratio and browser display capabilities.

Shows browser-reported display values only — no fullscreen pattern.

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.

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Estimate active refresh timing from browser animation frames.

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Monitor Test

Start with the checks that matter when a monitor is new or second-hand.

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Make it a full inspection

Run this test as part of a guided inspection and finish with a downloadable PDF report.

Start guided inspection

Read the guide: How to test a new monitor →

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.