If you use Windows 10 or 11, you already have a free video editor installed. Microsoft Clipchamp allows you to import a video, click a simple "Rotate" button on the timeline, and export it in full HD for free. 4. Online Video Rotators

The registration key unlocks these restrictions, turning the trial version into the "Pro" or full version.

This application, available from DVDVideoSoft, provides an intuitive interface where you can drag and drop videos and rotate them using simple on-screen buttons. It supports multiple output formats and batch processing, and it is completely free without any watermarks on the output.