Aspect Ratio 21:9 is a free Chrome extension developed by Patryk Rzucidło (PTKDev) that allows users to correct the aspect ratio and remove the black bars from ultrawide 21:9 monitors. This handy tool also supports adjusting different aspect ratios on 32:9 and 16:10 monitors.

One of the standout features of Aspect Ratio 21:9 is its compatibility with popular streaming platforms such as Netflix, Youtube, and Twitch. The extension even attempts to automatically correct the video player on unsupported websites.

Using the extension is simple. After installing it, users can open the popup by clicking on the extension's icon. From there, they can enable the desired streaming platform, such as Netflix. Once enabled, users can go to Netflix and play a video, and the black bars on the sides of the screen will be eliminated, providing a more immersive viewing experience.

Aspect Ratio 21:9 also offers shortcuts that can be customized by the user. These shortcuts can be set on the chrome://extensions/shortcuts page for easy access and convenience.

With its MIT License and open-source nature, Aspect Ratio 21:9 is a reliable and accessible tool for anyone looking to optimize their ultrawide monitor's display. You can find the source code and contribute to the project on its GitHub page.