Screen Flex

Screen Flex is a browser extension designed for resizing browser windows, previewing web pages within realistic device frames, and capturing screenshots. It addresses the needs of users who want to quickly view how a webpage appears on different devices, such as iPhone, iPad Pro, or MacBook Pro, and to generate device-accurate screenshots for use in design specs, bug reports, or marketing materials.

The extension allows users to resize their browser window instantly, either by selecting from common size presets or by entering custom width and height values. It offers both Window mode and Viewport mode for flexible resizing. Users can view any page inside a pixel-accurate device frame, with live-updating status bars, clocks, and icons to closely mimic real devices. The browser’s URL bar remains functional, allowing for normal navigation and refreshing while previewing. Additionally, Screen Flex provides a dedicated page that displays the current window size in large numbers, updating in real time as the window is dragged.

" Screenshots are saved as clean PNG files, precisely cropped to the device screen area. The extension stores all user data locally in the browser profile, and presets sync across signed-in browsers using the built-in storage API. No account, sign-in, ads, or tracking are required.

Screen Flex is available as an extension for Chrome and Firefox browsers. It is intended for tasks such as building responsive layouts, auditing landing pages, conducting design QA, or simply checking mobile display fidelity. The tool is produced by Elesari, Inc.