4K Resolution Test
Check the dimensions reported by your browser and compare them with common display sizes.
Browser viewport · CSS pixels
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Resize your window or enter fullscreen to update the measurements.
Reported screen · CSS pixels—
Device pixel ratio—
Screen aspect ratio—
Estimated screen pixel dimensions—
Available screen · CSS pixels—
4K UHD reference · pixels3840 × 2160
Not a native-resolution certification. The estimate multiplies reported screen size by device pixel ratio. Zoom, scaling, rounding and browser limitations can affect it. A 4K TV may report a smaller browser surface. Confirm the panel’s native resolution and active input signal in the display’s settings or documentation.
Resolution references
Bars compare pixel width only; these are reference dimensions, not measurements of your panel.
HD1280 × 720
Full HD1920 × 1080
QHD2560 × 1440
4K UHD3840 × 2160