Responsive Design Testing Tool: Viewport Resizer

Viewport resizer is a browser-based tool to test any website’s responsiveness. Just save the bookmarklet, go to the page you want to test, click on your created bookmarklet and check all kinds of screen resolutions of the page.

The smartest way to share your defined environment of devices and breakpoints directly with your team and client.

• Full customization
• Add and customize sizes on the fly
• Manually orientation toggle by click (portrait | landscape)
• Automatically device window orientation in “Auto Size” mode (portrait | landscape)
• Media query support
• Adapt meta viewport tag from current page