Fission: Fast & Lossless Audio Editing
Fission is an audio editor designed with simplicity in mind. Using Fission, you can quickly and easily trim and split MP3, AAC, Apple Lossless, FLAC, AIFF, and WAV files, with no quality loss. Split one large audio file into multiple files. Remove sections of audio from a file. Fade audio in and out. Fission will help you accomplish your editing needs with ease.
You can also use Fission to export audio from one format to another (save AIFF files as MP3, or Apple Lossless as AAC), to batch convert a group of files between formats, and even to create iPhone ringtones.
Editing audio has never been this simple or this inexpensive. Fission makes simple audio editing fast and affordable!
Getting Started
We recommend having a quick read-through of this manual, but you can also just dive in if you like. You can refer back to the full manual for assistance at any time by accessing it from the Help menu.
Updated in Fission 2.4.3
Critical Bug Fix: A hang which could occur when adding files together in Fission has been corrected.
Enhancement: Improved bitrate calculations now enable improved joining of some AAC compressed files, for better audio quality.
Bug Fix: To workaround a QuickLook and QuickTime Player bug which could prevent chapterized files from playing as expected, Fission now converts progressive JPEG images to baseline JPEG.
Bug Fix: The “Select Previous Clip” and “Select Next Clip” buttons now display properly, with no ironic clipping of the text itself.
Bug Fix: Ringtone saving no longer incorrectly overwrites an existing ringtone when saving a second time with the same name.
Other: Fission now has compatibility with MacOS 10.14 (Mojave).
Important Recent Updates in Fission
Major Enhancement: Fission's ability to save custom tones for iPhones (and other iOS devices) has been revamped for compatibility with iTunes 12.7.
Critical Bug Fix: We've fixed a (thankfully) rare bug where ringtone saving or publishing to SoundCloud would cause data in the ~/Public folder to be incorrectly deleted.
System Requirements
A Macintosh computer
Mac OS X 10.10 or higher
Installation and Removal
To install Fission, just drag it from your download folder to the Applications folder.
If you wish to remove Fission, simply drag it to the Trash.
Purchasing Fission
We provide a free trial of Fission for you to test. During the trial, the quality of audio saved with Fission is intentionally degraded with a series of audio fades. The full version of Fission can be unlocked with a license key from our online store.
When you're ready, head over to https://rogueamoeba.com/store/ to purchase Fission.
For more information, see the Purchasing page.
Upgrading to Fission 2
If you purchased a license for Fission 1, you're eligible for a heavily-discounted upgrade to Fission 2.