AdvanceToolbox

Viewport Size Tester

×
375 × 667
Category: MobileCurrent viewport: 375px × 667px

Device Presets

Common Breakpoints

Your Device

Screen Size
× px

Media Query

@media (max-width: 375px) { /* Your styles here */ }

Tips

  • •
    Use this tool to test how your website looks at different screen sizes.
  • •
    Some websites may block being loaded in iframes due to security settings.
  • •
    For more accurate testing, use browser dev tools or actual devices.
  • •
    Choose from common device presets or set custom dimensions.
  • •
    Use the rotate button to switch between portrait and landscape orientations.

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Viewport Size Tester: Your Complete Solution

Easily check your browser's current viewport dimensions with this responsive tool. Instantly view width and height in pixels to assist in responsive design testing and development.

Why is it Useful?

Knowing the viewport size is essential for responsive design and debugging. This tool:

  • Displays real-time viewport width and height
  • Helps with responsive breakpoints testing
  • Assists developers in designing for various devices
  • Provides instant feedback without dev tools
  • Useful for debugging layout shifts and overflow issues

Key Features

  • Live viewport size: Updates in real time as you resize the window
  • Pixel-accurate values: Displays width and height in pixels
  • Simple interface: Clean, distraction-free layout
  • Cross-device support: Works on desktops, tablets, and mobiles
  • No coding required: Ideal for designers and testers

How to Use?

  1. Open the Viewport Size Tester tool
  2. View the displayed width and height in pixels
  3. Resize your browser window to test different breakpoints
  4. Use the values for debugging or layout adjustment
  5. Repeat as needed for various screen sizes

Use Cases

Perfect for:

  • Frontend developers: Test and debug responsive layouts
  • Web designers: Ensure designs adapt to screen sizes
  • QA testers: Validate design behavior at different viewports
  • Content creators: Optimize visual content for devices
  • Students: Learn about responsive web design interactively

Benefits

  • Real-time feedback: Instant updates on viewport changes
  • No tools needed: Use without browser developer tools
  • Mobile-friendly: Works across all devices
  • Time-saving: Quickly verify responsive issues
  • Free and online: No downloads or setup required

Frequently Asked Questions

What is a viewport in web design?

A viewport is the visible area of a web page on a user's device or browser window.

Does this tool work on mobile devices?

Yes, it displays accurate dimensions on phones, tablets, and desktops.

How accurate are the displayed values?

They reflect the current window's inner width and height in pixels, based on your browser.

Do I need to install anything?

No, it's a completely online tool and requires no installation.

Can I use this for responsive breakpoint testing?

Yes, it's perfect for checking when CSS breakpoints apply as you resize the window.