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There are many video formats that are not suitable for use on the web, due to performance issues, user experience, or security concerns. The most important thing is to remember when optimizing online video is to provide users with a good experience. Resize video content for mobile devices, if you need to resize to the most common screen sizes by your visitors, adapted to the common screen size by your website or web application. Optimize videos to ensure they contribute to the user experience without harming it. Optimize video for business websites and especially eCommerce stores.