This compression is achieved by lowering the bitrate, reducing the resolution (typically 480p or 720p), using more efficient codecs (like HEVC/x265), and sometimes sacrificing audio quality (stereo instead of 5.1 surround).
allow users to download titles for offline viewing, with "Standard" quality settings typically resulting in files within the 300MB–600MB range for a standard 90-minute movie. A note on safety: 300mbplus Movies Download
Offers offline viewing with settings to control data usage. Download Prime Video Titles This compression is achieved by lowering the bitrate,