YouTube is the largest video repository on earth. With a YouTube Premium subscription, you can download directly to your mobile device. While YouTube serves its own format, many uploaders post full films under Creative Commons licenses. Use a download manager (for non-DRM content) to convert to standard MP4.
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: Websites like the Internet Archive offer a wide range of public domain movies that are free to watch and download in MP4 format. The Truth Behind the Search for "New MP4Movies