What Is My Screen Resolution
See your screen resolution, viewport size and pixel ratio instantly
What the What Is My Screen Resolution Tool Does
Screen resolution is the number of pixels your display shows, written as width by height, for example 1920 x 1080. Designers, developers, video editors and support teams all need that number, yet most operating systems bury it several menus deep. The What Is My Screen Resolution tool on WebTOOLkt reads the values your browser reports and displays them as soon as the page loads, with nothing to install and nothing to type.
It is useful any time you need to know how much room a page, image or video really has on your device.
How to Use the Tool
- Open the What Is My Screen Resolution page in the browser and on the device you want to check.
- Read the screen resolution shown on the page.
- Note the viewport size, which is the area your browser window actually uses for the page.
- Check the pixel ratio if it is displayed, since it explains why a sharp display can report a smaller number than its physical pixel count.
- Resize the window or rotate your phone and look again to watch the viewport values change.
Run the test on each device you care about. A laptop, a phone and an external monitor will all give different answers.
Screen Resolution, Viewport and Pixel Ratio
These three terms are often confused, and the difference matters when you build or test a website.
- Screen resolution. The size of the whole display as the browser sees it.
- Viewport. The visible area inside the browser window, without toolbars, tabs or scrollbars. Responsive layouts react to this value, not to the full screen.
- Device pixel ratio. The relationship between the pixels your browser uses for layout and the physical pixels of the panel. A ratio of 2 means each layout pixel is drawn with four physical pixels, which is why high density screens look crisp.
Mozilla documents the browser properties behind these values in its Screen API reference, and explains how mobile browsers handle layout in its viewport meta tag guide.
Common Screen Resolutions
You will meet the same handful of sizes again and again. 1920 x 1080, known as Full HD, is still very common on desktop monitors and laptops. 1366 x 768 appears on many older or budget laptops. 2560 x 1440 and 3840 x 2160 (4K) are found on larger, higher end monitors. Phones report much smaller numbers, and the exact values vary widely by model because of the pixel ratio described above. Rather than guessing, check the actual device.
Why It Matters
- Web design and testing. Know the real viewport you are testing in before you decide a layout is broken.
- Images and graphics. Choose export sizes that look sharp without wasting bandwidth.
- Screenshots and tutorials. Record at a size that your audience can read comfortably.
- Wallpapers and presentations. Pick files that match the display instead of being stretched.
- Technical support. Give a helper accurate details instead of describing the problem in words.
Things That Can Change the Result
Browser zoom changes the viewport values, because zooming in makes each layout pixel larger and fewer of them fit in the window. Operating system display scaling does the same thing at a deeper level, so a 4K monitor set to 150 percent scaling reports a smaller working size than its raw pixel count. If a number looks wrong, reset the browser zoom to 100 percent and test again before drawing conclusions.
Why Use This Tool Instead of Other Options
Operating system settings show the resolution but not the viewport, and developer tools show the viewport but require you to know where to look. This tool puts the key numbers on one page, loads instantly and works on any device with a browser. It also sits alongside related diagnostics on WebTOOLkt, so you can gather everything a designer or support agent needs in one visit.
Related WebTOOLkt Tools
- Screen Resolution Simulator to preview a page at other screen sizes.
- What Is My Browser to see your browser and version.
- What Is My User Agent to view the full user agent string.
- Image Resizer to resize pictures to the dimensions you need.
- Image Compressor to shrink image files for faster pages.
- What Is My IP to see the public address websites receive.
Useful External Resources
Frequently Asked Questions
Why is my viewport smaller than my screen resolution?
The viewport excludes browser toolbars, tabs and scrollbars, and it changes when you resize or zoom the window.
Why does my phone show such a small resolution?
Phones report layout pixels, not physical ones. A high pixel ratio makes the screen look sharp without increasing the reported size.
Is this information private?
These values are available to every website you visit, so they are not personal information on their own.
