You can convert your existing MP4 or AVI videos to WebM videos.
WebM video is a video format developed by Google.
It is available for commercial use completely free of charge, despite its high image quality and high compression.

Conversion is done locally. Videos are not sent to the Internet, so there is absolutely no risk of information leakage.
Conversion takes time, but even if you leave your computer unattended, the video will be saved automatically when the conversion is complete.

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