Window Resizer Chrome Extension

Test website responsiveness instantly with our free Window Resizer Chrome extension. Simulate multiple device screen sizes for perfect design testing.

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1,064+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Window Resizer Chrome Extension processes input data instantly inside your browser.

Sample Input Image dimensions: 4000 x 3000 pixels (File size: 5MB PNG)

Computed Result Output WebP Image: 1920 x 1440 pixels (File size: 350KB, 88% reduction)

Execution Mode Client-Side In-Browser JS

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About This Tool

Our Window Resizer Chrome extension is an essential tool for web developers, designers, and QA professionals who need to test website responsiveness across different screen sizes and devices. This lightweight browser extension allows you to quickly resize your browser window to predefined dimensions that match popular devices like iPhones, iPads, Android phones, tablets, and desktop monitors. With one-click resizing, you can ensure your websites look perfect on all devices without needing physical hardware. The extension includes presets for common resolutions and allows custom dimension input for specific testing needs. Perfect for responsive web design testing, cross-browser compatibility checks, and mobile optimization workflows.

Save your calculation history with a free account

How to Use

Install the Window Resizer extension from the Chrome Web Store
Click the extension icon in your Chrome toolbar
Select a preset device size (iPhone, iPad, Desktop, etc.)
Or enter custom width and height dimensions
Your browser window will instantly resize to the selected dimensions
Test your website's responsiveness and layout
Reset to original size with one click when finished

Frequently Asked Questions

Find Quick Answers

Is the Window Resizer Chrome extension free?

Yes, our Window Resizer extension is completely free to install and use with no hidden fees or subscription requirements.

Does this extension work with other browsers besides Chrome?

Currently, this extension is specifically designed for Google Chrome. However, similar functionality may be available for other browsers through their respective extension stores.

Can I add custom screen sizes to the presets?

Yes, the extension allows you to save custom dimension presets for frequently used screen sizes that aren't included in the default device list.

Will this extension affect my browser's performance?

No, the Window Resizer is a lightweight extension that uses minimal system resources and won't impact your browser's performance.

Is this tool useful for testing mobile websites?

Absolutely! The extension is particularly valuable for testing mobile-responsive designs by simulating various smartphone and tablet screen sizes without needing physical devices.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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