Window Resizer by Browserling – Responsive Web Tester

Resize your browser window to iPhone, iPad, Android, macOS, Windows, and custom screen resolutions for responsive web testing.

Window Resizer by Browserling is a browser extension that allows you to quickly resize your browser window to different screen resolutions for testing and development. The extension provides a popup interface where you can select predefined resolutions or add custom sizes. It is designed for web developers, QA testers, and designers who need to simulate various device screens efficiently. Key Features: • Predefined resolutions for multiple operating systems • Add custom width and height values for ad-hoc testing • Mark favorite resolutions for faster access • Quickly switch between resolutions with a single click • Ensures browser window stays within visible screen bounds • Shows error notifications if requested dimensions exceed screen limits • Persistent storage of options and favorites Interface: Popup: • Opens when clicking the extension icon in the browser toolbar • Displays OS sections to group resolutions • Shows resolution buttons with width × height • Allows adding custom resolutions via input fields and the Add button • Star icons to mark favorite resolutions • Clicking a resolution immediately resizes the active window How It Works: 1. Click the Window Resizer by Browserling icon in the browser toolbar 2. Select an OS section to view grouped resolutions 3. Click a resolution button to resize the window 4. Optionally, add a custom resolution and click Add 5. Use the star icon to mark favorites for quick access 6. If requested dimensions exceed screen limits, an error notification will appear Permissions: • activeTab — identifies the active tab for resizing • storage — saves settings, favorites, and custom sizes • scripting — executes scripts to calculate window and chrome sizes for precise resizing No unrelated user data is collected or processed. Notes: • Works directly in the active browser window • Supports quick testing of responsive layouts • Does not track browsing activity or collect personal data About Browserling: Browserling creates virtual browsers and browser utilities for developers, designers, security professionals, and technical teams worldwide. Window Resizer by Browserling is one of our independently developed, ad-free browser extensions, maintained as a trusted long-term solution. Our mission is to provide clean, focused tools that help users solve everyday browser-related tasks with ease.