SCREEN TOOL

Screen Resolution Test

Check your screen resolution, browser viewport, device pixel ratio, estimated physical pixels, orientation, aspect ratio, color depth, and other useful display information.

SCREEN RESOLUTION
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CSS Pixels
Viewport --
DPR --
Physical Est. --

Screen Resolution Information

Start the test to view your current screen and browser display information. You can also open fullscreen mode to compare the browser's fullscreen viewport.

Display Information
▣
Screen Resolution -- Browser-reported screen size
◫
Available Screen -- Excludes some system UI areas
↔
Browser Viewport -- Current webpage viewing area
◉
Device Pixel Ratio -- CSS pixels to device pixels
✦
Estimated Physical Pixels -- Screen size × DPR estimate
▭
Aspect Ratio -- Approximate screen proportion
↻
Orientation -- Portrait or landscape
◈
Color Depth -- Browser-reported bits per pixel
⬚
Pixel Depth -- Browser-reported pixel depth
◌
Touch Support -- Maximum touch points detected
⛶
Fullscreen Viewport Not active Updates while fullscreen is active
◇
Device Category -- Approximate browser-based category
Live Viewport
Current Browser Size Resize the browser window to see this update automatically.
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i
About Browser Resolution Values Browsers commonly report screen dimensions in CSS pixels rather than raw hardware pixels. On high-DPI or Retina displays, the physical pixel resolution may be higher. The physical resolution shown here is an estimate based on screen size multiplied by Device Pixel Ratio and may not match every device exactly.
-- Screen
-- Viewport
-- DPR

Screen Resolution Test – Check Display Resolution & Browser Size Online

The Screen Resolution Test on ZafScreen.com is a free browser-based tool that helps you quickly check important information about your display and browser. It can show your screen resolution, available screen size, browser viewport, device pixel ratio, estimated physical pixels, aspect ratio, orientation, color depth, pixel depth, touch support, fullscreen viewport, and device category.

Sounds technical, but it is actually very simple to use.

Click Check Resolution, and the tool reads the display information reported by your browser. You can then see values such as your current screen size in pixels and the size of the webpage viewing area. This is useful because your browser viewport is not always the same as your full screen resolution.

The Device Pixel Ratio gives another useful clue about how CSS pixels relate to physical display pixels. ZafScreen also provides an estimated physical-pixel value, helping you better understand how your device renders content.

You can check the approximate aspect ratio, such as 16:9 or 16:10, see whether the device is in portrait or landscape orientation, and review browser-reported color and pixel depth.

The Live Viewport section updates as you resize the browser window. This is especially handy for web designers and developers who want to understand how a page responds at different window sizes.

Want to compare normal browser mode with fullscreen? Use the Fullscreen option and check how the available viewport changes.

No installation. No signup. Just open the tool and check your display information in seconds.

Please note that some values are browser-reported or estimated. Operating-system scaling, browser zoom, device pixel ratio, external displays, and browser behavior can affect the numbers shown.

How to Use the Screen Resolution Test

  1. Open the Screen Resolution Test on ZafScreen.com.
  2. Click Check Resolution.
  3. Review your screen resolution and available screen size.
  4. Check the Browser Viewport dimensions.
  5. Review Device Pixel Ratio and estimated physical pixels.
  6. Check aspect ratio, orientation, color depth, and pixel depth.
  7. Resize the browser and watch the Live Viewport update.
  8. Click Fullscreen to compare fullscreen dimensions.

5 Useful Ways to Use the Screen Resolution Test

  1. Check Your Screen Resolution – Quickly see the browser-reported width and height of your display.
  2. Test Responsive Websites – Web designers can monitor viewport size while resizing a browser window.
  3. Check Aspect Ratio – Identify the approximate shape of the display, such as 16:9 or 16:10.
  4. Understand Device Pixel Ratio – Useful when working with high-density screens and responsive layouts.
  5. Compare Fullscreen and Browser Views – See how much viewing space changes when entering fullscreen mode.

Logos, Brand Names and Trademark Note

Any third-party logos, brand names, product names, trademarks, browser names, operating-system names, device names, or recognizable references appearing elsewhere on ZafScreen.com remain the property of their respective owners.

They are used only for identification, informational, descriptive, comparison, or simulation purposes where applicable.

ZafScreen.com is not affiliated with, sponsored by, endorsed by, or officially connected with any computer manufacturer, smartphone company, browser developer, operating-system provider, display manufacturer, or other third-party company unless clearly stated otherwise.

Frequently Asked Questions

1. What is a Screen Resolution Test?

A Screen Resolution Test checks browser-reported information about your screen size, viewport, pixel ratio, aspect ratio, orientation, and other display details.

2. Why is my browser viewport smaller than my screen resolution?

The viewport represents the webpage viewing area. Browser toolbars, tabs, operating-system elements, and window size can reduce the available space.

3. What is Device Pixel Ratio?

Device Pixel Ratio describes the relationship between CSS pixels used by webpages and the physical pixels used by the display.

4. Does the tool detect my exact physical monitor resolution?

Not always. Some values may be affected by operating-system scaling, browser zoom, display configuration, and browser reporting.

5. Do I need to install anything?

No. The Screen Resolution Test on ZafScreen.com runs directly in a compatible modern browser with no software installation or signup required.

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