Free Online What Is My Screen Resolution?
See your screen resolution, viewport size, pixel ratio, and color depth instantly.
Your screen right now
Detected live from your browser. Resize the window or rotate your device to update.
Full details
About the Screen Resolution Checker
Screen resolution is the number of physical pixels a display can show. The browser viewport is the area left for a page after browser chrome, scrollbars, and operating-system panels are removed. This tool shows both, plus the device pixel ratio, color depth, orientation, and touch capability of the current device.
Screen resolution vs viewport
A 1920 × 1080 monitor may report a viewport closer to 1920 × 940 once the browser toolbar and taskbar are subtracted. On high-DPI phones and laptops, CSS pixels also differ from physical pixels, which is why a 1080-pixel-wide phone may report a viewport around 360 to 430 CSS pixels.
Why developers check this
- Test responsive breakpoints at real widths.
- Confirm high-DPI assets match the device pixel ratio.
- Check layout behaviour when a device is rotated.
- Report display details accurately in bug tickets.
How to use this tool
- Open the page on the device you want to inspect.
- Read the live screen and viewport values.
- Rotate the device or resize the window to watch them change.
Frequently asked questions
Why is my phone viewport not 1080 pixels wide?
Mobile browsers report CSS pixels, not physical pixels. The device pixel ratio multiplies the CSS width to produce the physical resolution.
What is the device pixel ratio?
It is the number of physical pixels used for each CSS pixel. A ratio of 2 means a 400 CSS-pixel element is drawn across 800 physical pixels.
Can a website read my exact monitor model?
No. Browsers expose dimensions, pixel ratio, and color depth, but not the model or serial number of the display.