Screen Resolution guide
How to Read Screen Resolution, Viewport Size and DPR
Inspect screen and viewport dimensions, device pixel ratio and browser-reported orientation. Understand CSS pixels, zoom and physical-display limitations.
Open Screen Resolution →Before you start
- Use a current browser with JavaScript enabled. Read the limits below before using private or large inputs.
Step-by-step instructions
- 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.
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.Troubleshooting
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.
The interface does not respond
Enable JavaScript, use a supported browser and check the input limits. Reloading clears temporary input and results.
Privacy and cleanup
Inputs and results stay in the current tab. Nothing is uploaded or stored in input history. Optional analytics receives fixed tool identifiers only; entered data, file names and generated values are excluded.
Read the Privacy Policy for site preferences, optional analytics and hosting information.
Related tools and guides
Use Screen Resolution with the steps above, or continue with a related task.
Technical references
These references explain the underlying formats or browser behavior. The steps above describe the current AnyUtils tool.