What is My Viewport Size?

The viewport size is the visible area of a web page in your browser window. It's different from your screen resolution because it excludes browser chrome (toolbars, address bar, etc.) and only measures the actual content area. Understanding viewport dimensions is crucial for web developers, designers, and anyone working with responsive design.

1. Open the Tool: Simply load this page and the tool automatically detects your current viewport dimensions.
2. Resize Your Browser: Resize your browser window to see how the viewport dimensions change in real-time. The values update automatically.
3. Check Different Devices: Use browser developer tools to simulate different device sizes, or test on actual mobile devices to see real viewport dimensions.
4. Rotate Your Device: On mobile devices, rotate between portrait and landscape to see how orientation affects viewport dimensions.
5. Use for Testing: Use the displayed dimensions to test your responsive designs and ensure they work correctly at different viewport sizes.

• Viewport Width: The horizontal dimension of your browser's content area in pixels. This is what CSS media queries use for responsive design.
• Viewport Height: The vertical dimension of your browser's content area in pixels. Important for full-height layouts and mobile design.
• Device Pixel Ratio: The ratio between physical pixels and CSS pixels. Higher ratios (like 2x or 3x) indicate high-density displays like Retina screens.
• Orientation: Whether your device is in landscape (wider than tall) or portrait (taller than wide) mode.
• Device Type: Classification as Mobile, Tablet, or Desktop based on viewport width.
• Tailwind Breakpoint: The current Tailwind CSS breakpoint (sm, md, lg, xl, 2xl) based on your viewport width.

Web developers use viewport dimensions to create responsive designs that adapt to different screen sizes. CSS media queries rely on viewport width to apply different styles for mobile, tablet, and desktop layouts. Knowing exact viewport dimensions helps developers set appropriate breakpoints.

Modern web development follows a mobile-first approach, starting with mobile viewport sizes and scaling up. Understanding mobile viewport dimensions (typically 320px to 414px wide) helps developers design interfaces that work perfectly on small screens before expanding to larger devices.

QA testers and developers use viewport size tools to test websites at specific dimensions, ensuring layouts work correctly at common breakpoints. This helps identify issues before users encounter them on different devices.

When using CSS frameworks like Tailwind CSS, Bootstrap, or custom frameworks, developers need to know viewport dimensions to configure breakpoints correctly. Our tool shows the current Tailwind breakpoint, making it easy to test framework-specific responsive classes.

Designers use viewport dimensions to create mockups and prototypes that match real device sizes. Understanding actual viewport sizes helps designers create more accurate designs that translate better to development.

Developers can use viewport dimensions to optimize image sizes, load appropriate assets for different screen sizes, and implement responsive images. This improves page load times and user experience across devices.

Different browsers and devices may have slightly different viewport dimensions due to browser chrome variations. Testing viewport sizes across browsers helps ensure consistent layouts and user experiences.

Screen resolution is the total number of pixels on your physical display (e.g., 1920×1080). Viewport size is the visible content area in your browser, which is smaller because it excludes browser toolbars, scrollbars, and other UI elements. Viewport size is what matters for web design.

The viewport size represents the current visible area of your browser window. When you resize the browser, the visible content area changes, so the viewport dimensions update accordingly. This is exactly how responsive web design works - layouts adapt to the current viewport size.

Device pixel ratio (DPR) is the ratio between physical pixels and CSS pixels. A DPR of 2 means the device has twice as many physical pixels as CSS pixels (like Retina displays). Higher DPRs mean sharper images and text, but also require higher resolution assets for optimal quality.

Common mobile viewports are 320px, 375px, and 414px wide. Tablets typically range from 768px to 1024px. Desktop viewports commonly start at 1024px and go up to 1920px or larger. Testing at these breakpoints ensures your site works on the majority of devices.

Use CSS media queries that target specific viewport widths. For example, @media (max-width: 768px) applies styles when the viewport is 768px or smaller. Our tool helps you identify the exact breakpoints where your design should change.

Yes! The tool works perfectly on mobile devices and updates in real-time when you rotate your device. This is especially useful for testing how your designs look on actual mobile viewports, which may differ from desktop browser simulations.

Tailwind CSS uses predefined breakpoints: sm (640px), md (768px), lg (1024px), xl (1280px), and 2xl (1536px). The tool shows which Tailwind breakpoint your current viewport matches, helping you test Tailwind's responsive utility classes.

Viewport height excludes browser UI elements like the address bar, bookmarks bar, and status bar. On mobile devices, it also excludes system UI like the status bar and navigation buttons. This is the actual usable space for web content.