Screen information
Read screen and viewport dimensions, pixel ratio and orientation.
Diagnostic visuals retain their original colors and remain visible. Presentation filters and high contrast apply outside this workspace; device-level filters may still affect your observation.
Read the values at your current zoom, then resize or enter fullscreen and refresh the readout.
Enable JavaScript to run this interactive test. The guide and methodology below remain available.
How to run this check
Read the values at your current zoom, then resize or enter fullscreen and refresh the readout.
Understand the result
PASS describes a received signal or your recorded observation. WARNING calls for another check. USER REVIEW REQUIRED means a measurement alone cannot decide. An unavailable API or denied permission does not establish hardware failure.
What this cannot tell you
Screen and viewport values are CSS pixels. Multiplying by device pixel ratio does not guarantee physical panel resolution.
If something seems wrong
Check OS display settings for native resolution. Browser zoom and scaling affect reported values.
Understanding browser permissions →Good to know
Is anything uploaded?
Raw diagnostic input and media are processed locally. Standalone results remain in page memory. Guided checks offer optional coarse session recovery for 24 hours; it excludes media and detailed measurements. Hosting and Google Analytics requests still leave your browser. Analytics receives only broad test-usage categories, never these diagnostic contents. See the privacy policy.
Does a pass guarantee my hardware is healthy?
No. It records behavior observed in this browser session. Intermittent faults, internal components and operating-system restrictions need further investigation. See our methodology.
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