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Responsive Design Tester

Enter any URL and preview it at real device dimensions — iPhone SE to 4K desktop. Switch between portrait and landscape, zoom to fit, and compare multiple sizes side by side.

URL
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iPhone SE — 375×667
Some websites use X-Frame-Options or Content-Security-Policy headers that prevent iframe embedding. If a site appears blank, it may be blocking this preview.

How to Test Responsive Design

Preview websites at different screen sizes using The IT Hustle's free Responsive Design Tester.

  1. 1
    Enter a URLType or paste any website URL into the input field.
  2. 2
    Select a deviceClick a device preset (iPhone, iPad, laptop, desktop) or enter custom dimensions.
  3. 3
    Preview and rotateSee the website rendered in an iframe at the selected size. Use the rotate button to switch between portrait and landscape.
  4. 4
    Compare devicesUse side-by-side mode to view the site at multiple sizes simultaneously.

Frequently Asked Questions

Some websites set X-Frame-Options or Content-Security-Policy headers that block iframe embedding. This is a security measure and can't be bypassed from the browser. Try sites you own or that allow embedding.

This tool shows your site at the correct viewport dimensions, but it doesn't emulate mobile browser behavior (touch events, mobile CSS). For full mobile testing, use browser DevTools or real devices.

Yes, if your local development server is running. Enter http://localhost:3000 (or your port) and the iframe will load it.

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