Responsive Preview

What Is a Responsive Preview Tool?

The responsive preview tool loads a webpage inside an iframe at a chosen viewport size to check how its layout behaves on screens like phones, tablets, and laptops. It ships with presets for the iPhone SE, iPhone 12/13, iPad, laptop, desktop, and Full HD, and also accepts custom width and height values.

Key Features

• Built-in presets for iPhone, iPad, laptop, desktop, and Full HD screens
• Custom width and height from 200 to 4000 px
• URLs without a protocol get https:// prepended automatically
• Live iframe preview that resizes instantly
• Demo and clear buttons included

Use Cases / Notes

Useful for quickly checking how a page looks across different screen sizes during redesigns or integration. The preview depends on the target site's policies: if it blocks embedding via X-Frame-Options or CSP, the frame will be blank, which is the site's choice, not a bug in this tool.

How to Use

1. Enter the URL of the page you want to preview
2. Pick a device preset or type your own width and height
3. Click Preview and the page loads in that viewport