Yes, rotation requires re-encoding the video stream.

Rotate Video

Rotate or flip a video.

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About Rotate Video

Rotate a video 90°, 180° or 270°, or mirror it horizontally/vertically. Runs entirely in your browser.

Select or drag and drop your media file into the Rotate Video tool above. Your file is processed directly inside your browser using WebAssembly.
Configure your desired settings, conversion presets, or editing controls for the selected media.
Process your file locally and preview the result in the interactive player or canvas viewer.
Click Download to save the finished file directly to your device with no watermarks, accounts, or file size limits.

Other private, in-browser tools you might need.

Cut a clip out of a video, fast and lossless.

Join multiple video clips into one.

Trim the edges off a video frame.

Remove the audio track from a video.