Display resolution utility
Screen Resolution Test to check your display size online.
Check your screen resolution, browser viewport, device pixel ratio, available display size, color depth, and orientation online. This tool is useful for troubleshooting responsive layouts, browser scaling, monitor settings, and display context.
Method
How this screen resolution test works
The test reads browser display APIs and shows screen resolution, available screen size, browser viewport, device pixel ratio, color depth, pixel depth, platform, browser, and orientation.
Viewport size updates when you resize the browser window or rotate the device. The screen resolution values come from the active display context reported to the browser.
These are browser-visible values, not guaranteed raw monitor panel pixels. OS scaling, browser zoom, privacy settings, and connected displays can change what the browser reports.
Use cases
When screen resolution details help
Check viewport size while testing responsive layouts.
Confirm device pixel ratio on high-DPI displays.
Copy display context for support or bug reports.
Compare browser window size with full screen size.
Check available screen area after OS taskbars or docks.
Verify orientation after rotating a mobile or tablet device.
Limits
Why browser resolution can differ from monitor specs
Many operating systems use display scaling. A monitor may have more physical pixels than the CSS pixel resolution shown to the browser. Device pixel ratio helps explain that difference.
Browser zoom, multi-monitor setups, fullscreen state, mobile browser UI, and privacy protections can also affect reported resolution values. For troubleshooting, copy the full report rather than only the width and height.
Related Tools
Display performance tools in the suite
FAQ
Screen Resolution Test Questions
What is my screen resolution?
Your screen resolution is the width and height reported by the browser screen API. This page also shows viewport size, available screen size, device pixel ratio, color depth, and orientation.
Why is viewport size different from screen resolution?
Screen resolution describes the display area reported by the browser, while viewport size is the current browser window area. Browser chrome, tabs, sidebars, zoom, and responsive layout can make the viewport smaller.
What is device pixel ratio?
Device pixel ratio compares CSS pixels to physical display pixels. High-DPI screens often use a DPR above 1, so CSS pixel dimensions may differ from physical pixel dimensions.
Can browser APIs show exact physical monitor pixels?
Not always. Browser APIs usually report CSS pixels. OS scaling, browser zoom, display scaling, and privacy protections can affect the values.