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Have you ever wondered what a website will look like on a smartphone? Website developers carry out various tests to check how the final display will be like on various screen sizes. Here to help figure this out is a tool called Viewport Resizer.

test sites in different resolutions

Viewport Resizer is an easy to use browser tool that helps you view a website in a bunch of different display resolutions. The tool comes as a browser bookmarklet, therefore you can use it with any modern web browser. When you are visiting a website, click on the bookmarks to have a top ribbon of display size options appear on the website. You can click on different screen sizes to quickly view the site in those sizes.

Viewport Resizer also lets you create custom sizes that show you a website in a default screen size.

viewport resizer


  • A user-friendly browser tool.
  • Comes as a bookmarklet.
  • Lets you view websites in various display sizes.
  • Lets you create custom bookmarklet for default screen size.
  • Similar tools: TestSize and

Check out Viewport Resizer @

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  1. Nevzat Akkaya
    February 25, 2013 at 6:53 am

    This is a gem for web designers and programmers, thanks.