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What Is My Screen Resolution?
See your screen resolution, browser viewport size, device pixel ratio and colour depth instantly — updates live as you resize the window.
Screen resolution
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Screen vs viewport — which number do you need?
Screen resolution is your display's size in CSS pixels; the viewport is the part your browser window currently shows — resize the window and watch it update live above. Web designers target viewports, screenshot instructions target screens, and the device pixel ratio explains why a "1080p" phone reports a much smaller CSS width: modern screens pack multiple physical pixels into each CSS pixel for sharpness.
Frequently asked questions
Why does my 4K monitor show 1920×1080?
Your OS runs at 200% scaling, so the browser sees 1920×1080 CSS pixels with a device pixel ratio of 2 — that's 3840×2160 physical pixels, exactly 4K.
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