ViewportSmith is a powerful Chrome extension designed for web developers and designers to efficiently test responsive layouts. This add-on allows users to resize browser windows to match various screen resolutions, making it easy to see how designs will appear on different devices. With custom presets available for mobile, tablet, laptop, and desktop views, it accommodates a wide range of testing needs. The extension offers a fully customizable resolution list, precise window positioning controls, and options for viewport-only or full-window resizing, ensuring flexibility in layout testing.

Additionally, ViewportSmith enhances usability with global keyboard shortcuts for quick switching between presets, as well as the ability to export and import settings for use across multiple devices. Its device-specific icons provide quick identification, streamlining the workflow for responsive design testing. Importantly, all features are available offline, with no external dependencies required, making it a reliable tool for developers on the go.