MP3Smaller is a free service that allows you to reduce MP3 file size online, reduce size of the mp3 files, make mp3 smaller, reduce mp3 bitrate. Reduce size of MP3 files online, directly from your web browser. Useful service to fit more songs on your MP3 player by reducing the audio bit-rate. Just select the MP3 audio file and then click the button "Upload Now". After few seconds you will be able to download the new, smaller MP3 file.