Viewport Size Simulator
Emulate device screen sizes visually in the browser. Test responsive designs across different viewport dimensions.
Viewport Settings
Mobile
Tablet
Desktop
Current viewport: 375 × 667 px (scaled to 90%)
Preview
Simulating iPhone SE viewport
⚠️ Website Loading Limitations
Some websites may not load in the preview due to security restrictions called "X-Frame-Options" or "Content Security Policy" headers that prevent embedding in iframes.
✅ Usually Work:
- • Personal websites and blogs
- • Documentation sites
- • Portfolio websites
- • Most static sites
- • GitHub Pages
❌ Often Blocked:
- • Google, Facebook, Twitter
- • Banking and financial sites
- • E-commerce platforms
- • Sites with strict security
- • Many popular web apps
💡 Alternative Testing Methods:
- • Use browser developer tools (F12 → Device Toolbar)
- • Test with your own websites or development servers
- • Use responsive design testing tools in your browser
- • Try websites that allow iframe embedding
This limitation is a security feature implemented by websites to prevent clickjacking attacks and is not related to this tool's functionality.
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