HandBrake

HandBrake is an open-source video transcoder available for Windows, macOS, and Linux. It can convert video files from almost any format to widely supported modern codecs (such as MP4, MKV, WebM, H.264, H.265, and AV1). It features hardware-accelerated encoding, crop and scale filters, subtitle insertion, and pre-configured device presets for optimal playback on mobile devices, TVs, and web platforms.