To save disk space, you may want to compress files from uncompressed files and import them into your music library. MP3 and Apple Lossless Encoder are two examples of compressed formats. You can also import songs to the Apple Music app and iTunes for Windows, and then convert them simultaneously. Based on your preferences in iTunes for Windows or Apple Music, this creates a copy of the file in your music collection. Please visit https://www.audio-conver.com/ for more detail.