Crop and trim audio, paste in or join files, or just rapidly split one long file into many. Fission is streamlined for fast editing. Plus, it works without the quality loss caused by other editors, so you can get perfect quality audio even when editing MP3 and AAC files.

If you need to convert formats, Fission can do that too, with simple export or batch conversion to the MP3, AAC, Apple Lossless, FLAC, AIFF, and WAV formats.

Fission makes audio editing fast and easy - get it now!

What's New
This update fixes a slew of very tiny, almost microscopic bugs. But like fleas, those bugs can bite, and we aim to exterminate them! Here's a list of what's fixed:

  • A problem some users saw with Exporting and Transcoding acting unresponsive, even as it worked, should now be gone. Fission is sorry if it seemed to be ignoring you while it worked.

  • The Start Window now remembers its state between files and launches. If you close it, it'll stay pretty well closed, and not annoy you so much. But please, don't you forget about it.

  • Fission now better remembers previously used settings for saving and exporting. Amnesia be gone!

  • Progress bars should now appear more reliably when exporting audio.

  • An issue where the Mac App Store version of Fission would fail to save to a previously-specified location is now fixed.

  • Several small issues related to re-encoding of audio have been corrected, preventing unnecessary re-encoding.

  • Fission is now better a reading in chapterized AAC files. It was already pretty great, to be sure, but now it's even better.

  • Several VoiceOver improvements have been made, with labels on previously unlabeled controls. We've still got more work to do, so watch for further updates, VoiceOver users!

  • A conflict with Many Tricks' window manager Moom, which caused the selection of split points to fail, has been handled.

  • Assorted rare crashes should now be even more rare, so rare that you might suspect they're gone entirely, which they are!

  • There are probably other improvements which we've forgotten. The best way to be sure you've got them is, of course, to update.

  • Fission (com.rogueamoeba.fission) is a Mac software application that has been discovered and submitted by users of The latest version that our users have reported running on their systems is Fission 2.1.2. The most popular version of this application used by our users is Fission 2.3.0.

    Operating System: Mac

    Default Install Path: /Applications/

    Minimum OS version: 10.6.0

    Bundle Information: 2.1.2 (c)2003-2012 Rogue Amoeba Software, LLC