HandBrake

HandBrake is an open-source, cross-platform video transcoder that allows users to convert video files from one format to another. It supports a wide variety of input formats and provides users with the ability to customize various details such as aspect ratios, frame rates, and bitrates. HandBrake is particularly popular for its ability to convert large video files into formats that are more manageable and suitable for a variety of devices, such as smartphones and tablets.