If the audio files eat up too much storage space of your portable device, maybe you want to make them smaller. Don't want to learn how to change the complicated settings to make the audio files smaller? Actually you don't have to be so professional to do this. With Audio Shrinker, you just need to specify the compress ratio, for example, 50%, then let Audio Shrinker do others for you. Audio Shrinker may directly compress AAC, AC3, MP3, M4A, OGG and WMA formats for you.