What Is My Screen Resolution

Your screen resolution is the number of pixels displayed horizontally and vertically on your screen — for example, 1920×1080 means 1,920 pixels wide and 1,080 pixels tall. Knowing your exact screen resolution is useful for web development, UI design, display troubleshooting, and testing how websites render on different screen sizes. The What Is My Screen Resolution tool detects your current display resolution the moment the page loads — automatically, with no input required.

Whether you are a web developer testing a responsive design, a designer working with display specifications, or simply a curious user wondering what resolution your monitor is running at, this tool gives you the precise answer instantly.

How It Works

Simply open the What Is My Screen Resolution tool page. The tool reads your device's screen properties directly through your browser and instantly displays your screen width, screen height, browser viewport width, and browser viewport height — all without requiring any input from you. No downloads, no plugins, and no account are needed.

Results are displayed in pixels and are accurate to your current display configuration. If you are using a multi-monitor setup, the tool detects the resolution of the monitor on which the browser window is currently displayed.

Screen Resolution vs Browser Viewport — What's the Difference?

Many users are surprised to find two sets of measurements rather than one. Here is what each means:

Screen Resolution

Screen resolution refers to the total number of pixels on your physical display. This is a hardware specification set by your monitor or device screen. For example, a Full HD monitor has a screen resolution of 1920×1080 pixels. This figure does not change based on what applications are open on your screen.

Browser Viewport Size

Your browser viewport is the visible area within your browser window where web content is displayed. It is smaller than your screen resolution because it excludes the browser's own interface — the toolbar, address bar, bookmarks bar, and any other browser chrome. The viewport size changes if you resize the browser window, zoom in or out, or change your browser's display settings.

For web developers and designers, the viewport size is typically the more important measurement because it determines how much content a visitor can see without scrolling, and it is the dimension that CSS media queries respond to.

Key Features

• Automatic detection of screen resolution and viewport size on page load
• Displays both screen resolution (hardware) and browser viewport (content area) dimensions
• Shows width and height measurements in pixels
• Updates dynamically if you resize your browser window
• Works on desktop, laptop, tablet, and mobile devices
• Free with no account, no software, and no input required

Benefits for Users

• Get an instant, accurate reading of your display configuration without navigating device settings
• Understand both your physical screen dimensions and the usable browser content area
• Verify viewport dimensions quickly during web development and responsive design testing
• Confirm your screen resolution when troubleshooting display or rendering issues
• Check how your display settings compare to common screen resolution benchmarks
• Access resolution data across different devices without installing any software

Common Screen Resolutions Explained

Screen resolutions are commonly grouped into standard categories that are widely referenced in web design, development, and display specifications:

HD — 1280×720

Also called 720p, HD resolution is commonly found on older laptops, budget monitors, and smaller devices. Websites designed for modern viewports may display some content at reduced density on these screens.

Full HD — 1920×1080

Full HD or 1080p is currently the most common desktop and laptop screen resolution globally. It represents a reliable baseline for web design and is considered the standard target resolution for most website layouts.

QHD / 2K — 2560×1440

Quad HD resolution is found on higher-end monitors, gaming displays, and premium laptops. Websites display with sharper detail at this resolution, and high-resolution images benefit from the increased pixel density.

4K / UHD — 3840×2160

4K Ultra HD resolution offers four times the pixel density of Full HD. While still primarily found on premium monitors and professional workstations, 4K is increasingly common and should be considered when designing high-resolution image assets and layouts.

Mobile Resolutions

Mobile screen resolutions vary widely across devices, but common display widths for smartphones range from 360px to 430px in CSS pixels (the unit web browsers use for layout), despite having much higher physical pixel counts due to high device pixel ratios. The What Is My Screen Resolution tool reports CSS pixel dimensions — which is what matters for responsive web design.

Use Cases

• Web developers checking their own display configuration before beginning a responsive design project
• Designers verifying they are working in the correct resolution context for mockups and prototypes
• QA testers documenting their test environment's display settings for bug reports
• Users troubleshooting display issues and needing to confirm their screen resolution for technical support
• Students and learners understanding the relationship between screen resolution and browser viewport
• Anyone comparing their display configuration against a website's recommended or minimum screen size requirements

Related Tools

If you need to test how websites look across different screen sizes and resolutions, use the Screen Resolution Simulator to preview any website at a specific viewport dimension. If you are testing browser-specific rendering, the What Is My Browser and What Is My User Agent tools provide your complete browser environment details.

Related tools: Screen Resolution Simulator · What Is My Browser · What Is My User Agent · Page Size Checker