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.

Don't forget ringtones! Use Fission to make great custom ringtones for all your contacts.

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

What’s New

Version 2.4.5

New in Fission 2.4.5:
* Enhancement: Loading times have been improved for several audio formats.

* Enhancement: Fission now supports very long AAC files.

* Bug Fix: A bug in transcoding the final samples of a file to AAC has been corrected.

* Bug Fix: An issue where Fission would erroneously complain about files changing on disk has been corrected.

Ratings and Reviews

Flipped ,

Audio Swiss Army knife

I bought Fission for a large project where I had several 90 minute vocal recordings that I needed to cut out the empty audio spaces between each talking section while maintaining the same audio quality and not recompressing when saving. It worked simply and brilliantly for this. It took about 5-10 minutes to figure out. After using it for that simple project I've found myself using more of it's features for other things like breaking apart live musical recordings for iTunes and other little things that come up that I would have previously had to go through hoops to do. It's simple, quick and efficient. It's not a full featured audio editing suite - and that's what I love about it. I can do 90% of the things I need to do with audio files with Fissions' feature set. If you need to do simple audio editing, or clean up recordings and tags for iTunes you can't beat this software.

I would only ask that the developers consider making a version of Fission for video files. That would be a killer app.

JaeBeeTee ,

Can’t say enough good things about this app

First of all, if you are looking for an MP3 editor, this is the only one to get. Don’t waste your time looking at anything else. Seriously. Fission has changed my world as far as editing long form MP3 files goes. I routinely need to record 1+ hour sessions straight to MP3 and Fission makes it so easy to trim, fade in, fade out, export sections, add tags and transcode to another format. It does it super quick and if you are saving in the format you originally edited in, there is absolutely zero loss of quality for the most part. Only the parts where you fade or change levels have to be re-encoded. I usually don’t do app reviews, but this one is such a great one that I had to do a review. Rogue Amoeba makes some awesome applications and utilities and ALL of them are tools that anyone who routinely works with audio needs to have. Do not balk at the price. Quality apps are worth every penny. This one is no exception. Great job, developer. Keep it up.

jqdaily ,

Quick, Clean, and Simple

This app is really saving me, as I just inherited the job of maintaining the digital music collection for my local Hall of Worship. Fisison is not for advanced audio editing – it is for making fast and simple edits to existing audio tracks without having to open an audio software suite or bother with iTunes.

Fission opens and operates VERY quickly, making it easy to batch convert WMA files to AIFF for importing into iTunes, losslessly cut or add a couple of seconds of silence to a track, adjust output volume, edit metadata tags, etc.

I WISH Fission would let you batch edit metadata tags for multiple files. Otherwise, everything that this app does, it seems to do very well.


Rogue Amoeba Software, LLC
8.7 MB
OS X 10.11 or later, 64-bit processor
Age Rating
Rated 4+
© Rogue Amoeba Software, Inc.


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    With Family Sharing set up, up to six family members can use this app.

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