Viewport Resizer – Responsive Testing Tool

Good, but like many of this kind of tools it need to be updated with new resolutions for mobile. Right now you can look at iPhone 5 to 8 when their is iPhone 15 Pro Max out on market

Good - but flawed. It doesn't refresh the page as you navigate, and just seemingly springs back to full resolution whenever it likes. Also you can't save your custom resolutions.

not work in localhost web, need to be hosted.Tried www.responsinator.com/, better and you can test for localhost

Easy, working, but one type with an example on different screen sizes would be great, like material.io had (though their Resizer tool isn't working at all, bad stuff)

This extension has saved my life. Literally. Recently, our workplace website was upgraded and this new site could no way be adjusted to a mobile screen display. But by using Kiwi browser + this extenion, I did get what I wanted. An thereby could avoid the purcahse of a tablet!

Too bad it doesn't work for local files. I wanted to use it as a dev tool...

SO USEFUL! Thank you so much!

Excellent extension. Does not require any privileges, resizes just the viewport and works for resolutions larger than your own screen. The animate feature is great for seeing all sizes one by one without lifting a finger. Recommended for developers.

Use this extension to test web design. It's the best I've tried. The animation option is fantastic. Great job!

Doesn't work properly...