How it works
Open Screen Resolution and read the reported screen dimensions. Compare Available screen with Screen; system UI can reduce the available area. Read Layout viewport and Visual viewport separately. Resize the browser or change zoom and watch the metrics update. Copy the fixed metric summary if you need it for a layout bug report. Dimensions are browser-reported CSS pixels. Device pixel ratio describes the relationship between CSS pixels and device pixels and can change with zoom or moving between displays. Multiplying dimensions by DPR does not certify a physical panel specification. Browsers may round or restrict screen information. Visual viewport can shrink with a mobile keyboard or pinch zoom.
Interpret results and limitations
Dimensions are browser-reported CSS pixels. Device pixel ratio describes the relationship between CSS pixels and device pixels and can change with zoom or moving between displays. Multiplying dimensions by DPR does not certify a physical panel specification. Browsers may round or restrict screen information. Visual viewport can shrink with a mobile keyboard or pinch zoom.
Example
Use this example to understand the expected behavior before working with your own input.
A 1440 × 900 CSS-pixel screen with DPR 2 does not by itself certify the monitor model or physical resolution.Continue your task
Dead Pixel Test — Continue with this related local tool.
webcam test — Continue with this related local tool.
Frequently asked questions
The numbers change when I zoom?
Zoom can change CSS-pixel dimensions and DPR. Reset zoom when comparing values; use manufacturer specifications for physical-panel details.
Is my input uploaded or stored?
No. Processing and results stay in this tab. There is no input history or server processing. Copy and download are explicit actions.
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