Toolzie

Screen & Viewport Info

Screen Resolution

Screen Width (px)
Screen Height (px)

Browser Viewport Size

(Updates on window resize)

Viewport Width (px)
Viewport Height (px)

How to Use the Screen Resolution Checker

Open page. Your resolution, viewport, and pixel density auto-detected and displayed.

Know exact screen dimensions for responsive testing across devices.

Frequently Asked Questions

Difference?

Resolution: total pixels; viewport: browser content area.

Pixel ratio?

Devices pixels per CSS pixel; Retina ~2x.

Zoom?

Affects reported viewport and ratio.

Responsive?

Yes, set accurate CSS breakpoints.

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About This Tool

Check your current screen resolution, viewport size, pixel ratio, and colour depth with the Toolzie Screen Resolution tool — instantly, with no setup required. Useful for web developers and designers testing responsive layouts.

How to Use

  1. Open this page on any device.
  2. Your screen resolution, viewport dimensions, and device pixel ratio are displayed automatically.
  3. Resize your browser window to see the viewport size update in real time.
  4. Share or note your resolution for testing purposes.

Frequently Asked Questions

What is the difference between screen resolution and viewport size?

Screen resolution is the total number of pixels on your display. Viewport size is the area your browser window uses, which changes when you resize.

What is device pixel ratio (DPR)?

DPR is the ratio of physical pixels to CSS pixels. A DPR of 2 means your screen has twice as many physical pixels as CSS pixels — common on Retina displays.

What is the most common screen resolution?

1920×1080 (Full HD) is the most common desktop resolution globally. On mobile, 390×844 (iPhone 14) and similar sizes are very common.

Why do I need to know my viewport size?

Web developers use viewport sizes to test responsive breakpoints and ensure layouts look correct at different screen sizes.