Responsive Design Tester
Multi-device viewport testing made simple
Website URL
Device Presets
Mobile Devices
iPhone 15 Pro
393 × 852
iPhone 15
393 × 852
iPhone SE
375 × 667
Samsung Galaxy S24
412 × 915
Google Pixel 8
412 × 915
OnePlus 11
412 × 915
Tablet Devices
iPad Pro 12.9"
1024 × 1366
iPad Air
820 × 1180
iPad Mini
744 × 1133
Samsung Galaxy Tab S9
1024 × 1366
Surface Pro 9
912 × 1368
Desktop Devices
MacBook Pro 16"
1728 × 1117
MacBook Air 13"
1440 × 900
Dell XPS 15
1920 × 1080
Surface Laptop 5
1536 × 1024
Ultra-wide (1440p)
2560 × 1440
4K Display
3840 × 2160
Custom Viewport
Responsive Design Tester
Multi-device viewport testing made simple
Features
- Multi-device viewport testing
- Real-time responsive preview
- Device preset library with 20+ devices
- Custom viewport controls
- Screenshot capture and export
- Responsive design analysis
- Performance metrics
- Accessibility testing
- Mobile-friendliness scoring
- Layout shift detection
How to use
- Enter the website URL you want to test
- Select device presets from mobile, tablet, or desktop categories
- Create custom viewports with specific dimensions if needed
- Choose testing mode (Live Preview, Screenshot, or Analysis)
- Click 'Test Responsive Design' to start testing
- Review results, metrics, and recommendations
- Export screenshots or analysis reports
Tips & Best Practices
- Preview changes in real-time as you adjust the settings.
- Copy the generated code directly into your CSS stylesheet.
- Test your designs in both light and dark mode for accessibility.
- Use the browser developer tools alongside this tool for live testing.
- Save your favorite configurations for quick access later.
FAQ
What devices can I test with?
Test across 20+ device presets including iPhone 15 Pro, iPad Pro, Samsung Galaxy S24, MacBook Pro, and more. You can also create custom viewports with any dimensions.
Can I test local HTML files?
Yes, you can upload local HTML files or test localhost URLs for development testing. The tool supports both local and remote websites.
How accurate are the device simulations?
Our tool uses real device dimensions, pixel densities, and user agents for accurate responsive testing. Each preset is based on actual device specifications.
Can I export test results?
Yes, export screenshots, analysis reports, and responsive design recommendations in multiple formats including PNG, PDF, and detailed JSON reports.
Does the tool work with JavaScript-heavy sites?
Yes, the live preview mode supports full JavaScript execution and interactive testing. You can test forms, animations, and dynamic content.
What testing modes are available?
Three modes: Live Preview for interactive testing, Screenshot for visual comparison, and Analysis for detailed responsive design auditing with metrics and recommendations.
How do I create custom viewports?
Use the Custom Viewport section to set specific width, height, and orientation. Perfect for testing unique screen sizes or specific breakpoints.
What metrics does the analysis provide?
The analysis includes load time, accessibility scores, mobile-friendliness, layout shifts, and detailed issue reports with actionable recommendations. This is designed to handle both simple and complex use cases efficiently, giving professional developers a reliable everyday tool.