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Breakpoint Preview

Resize a mock page to any width and copy the matching media query.

Preview a layout at any width

Mock Site Home Guides Pricing Contact
Hero section with a short headline and one line of supporting copy.
Viewing at 768px · layout: Tablet
The mock page is a plain container rather than an iframe, so it resizes without reloading.

How to use the Breakpoint Preview

  1. Drag the width slider or press one of the preset buttons.
  2. Watch the mock page reflow as the viewport gets narrower or wider.
  3. Copy the media query that matches the width you are viewing.

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Frequently Asked Questions

Common questions about the free online breakpoint preview.

It is the width at which a layout changes, usually written as a media query such as max-width 768 pixels.
Drag the width slider or press a preset to see how the mock page reflows, then copy the matching media query.
The mock page is a normal container that is resized directly, so there is no nested document and no extra loading.
Common choices are 480, 768 and 1024 pixels, but the right values depend on your own content and design.
The styles inside apply when the viewport is at most that wide, which is the usual way to write mobile friendly rules.
No. It shows a mock page built from simple blocks so you can judge how a typical layout reflows at each width.
They are common reference widths. Real devices vary, so always test on more than one screen when you can.
Yes. It is completely free, needs no account and runs entirely in your browser with no uploads at all.

Last updated: October 10, 2026