Responsive Design Tester

Preview websites at different screen sizes and resolutions with comprehensive device viewport testing for responsive design verification across mobile, tablet, and desktop platforms. This testing tool provides device presets, custom screen sizes, breakpoint analysis, rotation simulation, and side-by-side comparisons with professional testing capabilities. Perfect for responsive web design, cross-device testing, mobile optimization, and ensuring consistent user experience across all devices and screen sizes for universal accessibility.

Device Presets Custom Screen Sizes Breakpoint Analysis Rotation Simulation

Creative Studio

375x667 (iPhone)

768x1024 (iPad)

1920x1080 (Full HD)

Website URL

Enter URL to Test

Enter the full URL including https://

Some websites may block iframe embedding. Try your own website for best results.

Quick Device Selection

Popular Devices

Custom Size

Width (px)

Height (px)

Display Options

Show device frame

Show dimensions

Device Preview

No Device Selected

Enter a URL and select a device to preview

Tip: Use the button for fullscreen view

Screenshot Tips

To capture a screenshot of the preview:

Windows: Press Win + Shift + S
Mac: Press Cmd + Shift + 4
Or use your browser's developer tools (F12)

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

What device sizes and resolutions can I test?

The tester typically includes popular device presets (iPhone, iPad, Android phones/tablets, desktop resolutions) and allows custom dimensions. This covers the most common screen sizes your users encounter.

Can I test responsive breakpoints and media queries?

Yes, you can see how your design adapts at different breakpoints, test CSS media queries, and identify layout issues that occur between common device sizes or orientation changes.

Does this replace testing on actual devices?

While very helpful for initial testing, it doesn't replace testing on real devices. Actual devices have different performance, touch interfaces, and browser quirks that simulators can't fully replicate.

Can I take screenshots at different screen sizes?

Many tools allow capturing screenshots at various resolutions, helping document responsive behavior, create design presentations, or identify issues for debugging and improvement.

Is this useful during the design and development process?

Extremely useful! Test responsiveness continuously during development, validate designs across devices, identify layout problems early, and ensure consistent user experience across all screen sizes.