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What Is My Screen Resolution? Check Your Display Size

What is my screen resolution? This free tool shows your screen size, your browser window size, the device pixel ratio and the color depth. The numbers update live when you resize the window.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is My Screen Resolution?

Your screen resolution is the number of pixels your display shows across and down, such as 1920 by 1080. It decides how much fits on the screen, how sharp text looks and which layout a responsive website chooses. If you have ever asked “what is my screen resolution?”, this tool gives the exact answer in one glance.

It also shows the size of your browser window, the device pixel ratio and the color depth, and it updates live when you resize the window or rotate your device.

How to Use This Tool

  1. Open the page. Your numbers appear immediately.
  2. Read the large figure at the top: your screen width and height in pixels.
  3. Check the table for the window size, pixel ratio and color depth.
  4. Resize the window and watch the viewport values change.

The Numbers Explained

ValueMeaning
Screen sizeThe full display in CSS pixels, as reported by the system.
Available screenThe display minus fixed bars, such as the taskbar.
Browser window (viewport)The area inside the browser where pages are drawn. Responsive layouts depend on this.
Device pixel ratioHow many physical pixels make one CSS pixel. High-density screens report 2 or 3.
Estimated physical pixelsScreen size multiplied by the pixel ratio, close to your panel’s native resolution.
Color depthBits used per pixel. 24 bit is standard.

The values come from the browser’s own screen interface, documented in the MDN Screen reference.

Common Screen Resolutions

  • 1366 x 768: older and budget laptops.
  • 1920 x 1080 (Full HD): the most common desktop monitor.
  • 2560 x 1440 (QHD): larger monitors and gaming screens.
  • 3840 x 2160 (4K): large monitors and TVs, usually scaled by the system.
  • 360 x 800 and 390 x 844: typical phone sizes in CSS pixels.

Why the Numbers May Not Match Your Monitor

Operating systems often scale the display to make text larger. At 150 percent scaling, a 4K monitor reports about 2560 by 1440 CSS pixels, but the tool also shows an estimate of the physical pixels. Browser zoom changes the viewport values too, so reset zoom to 100 percent for a clean reading.

To see how a website looks at other sizes, use the screen size simulator. To learn what browser and system you run, try the browser checker or the user agent tool.

When You Need These Numbers

Designers use them to choose breakpoints, support agents ask for them to reproduce display problems and gamers check them before changing settings. Knowing your real window size also explains why a page looks different from one screen to another.

Frequently Asked Questions

Screen size is the full display in CSS pixels. Window size, also called the viewport, is the part your browser uses for the page, which is smaller because of toolbars.
It tells how many physical pixels make one CSS pixel. A ratio of 2 means a sharper, high-density screen where each CSS pixel uses a 2 by 2 block of pixels.
If your system uses display scaling, such as 125% or 150%, the browser reports the scaled size. The tool also estimates the physical pixels.
Browser zoom changes the CSS pixel size. At 200% zoom the window looks half as wide in CSS pixels, so the reported values change.

Disclaimer: results come from live requests and can change as records and servers change. We cannot guarantee that every answer matches what every visitor sees.