Sponge is an OS X application for converting audio files. It will absorb files in a number of formats and produce files in just a few common, easily manipulated formats.

Sponge is specifically designed to produce very high quality conversions suitable for broadcast.

What formats does it read?

Currently, Sponge can read MP2, MP3, AIFF, SD2, WAV, AU, SND, AAC and many others. Drag your file onto Sponge to see if it can be converted.

What formats does it create?

Currently, only AIFF, SD2 and MP2.

Can I change the sample rates of my files?

Yes, consult the Preferences panel.

Can I drag files onto the Sponge application icon?

Yes, you can.

Can I re-encode the files I bought from the Apple Music Store?


What license do I need?

Sponge is free, open-source software, licensed under the
GNU General Public License.

What version of OS X do I need?

Sponge will work with Mac OS X version 10.5 and above.

What other software did you use to build Sponge?

Sponge depends on some great open-source audio processing libraries:
libmad, libsndfile, libtwolame and libsamplerate. As well as the Apple QuickTime framework.

Questions and comments?

Version 0.5.3
Download Application

(Download version 0.4.0 for Mac OS 10.3 and 10.4
Download Source Code