Fission Icon


Fast & lossless
audio editing

With Fission, audio editing is no longer a chore. You can join files, crop and trim audio, and rapidly split up long files. Fission is streamlined for fast editing, and it works without the quality loss other audio editors cause.

If you need to convert between audio formats, Fission can do that too. Rapidly export or batch convert files to the MP3, AAC, Apple Lossless, FLAC, AIFF, and WAV formats. Fission has all your audio needs covered. Finally, simple audio editing has arrived.

Audio Editing Made Simple

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Fade, Cut, Crop & Edit Metadata

Fission offers all the standard audio editing options you need right at your fingertips. Unlike overly complicated competitors, there's no clutter or bloat.

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Edit Audio with No Quality Loss

Fission never causes quality loss when it edits, even with the MP3 and AAC formats. It's like magic, and it's something only Fission offers!

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Batch Convert Between Formats

Fission's batch convertor lets you convert dozens of files at once, to any of the most popular formats: MP3, AAC, Apple Lossless, FLAC, AIFF, and WAV.

Many More Great Features

Cross-Format Conversions

Any file Fission can open can be saved directly to MP3, AAC, Apple Lossless, FLAC, AIFF, or WAV.

Chapterized AAC & MP3 Files

Make enhanced podcasts with AAC or MP3 chapters using Fission. Your listeners will love you for it!

Quick Audio Removal

Cutting out audio couldn't be easier. Just select and cut!

Full FLAC Support

If you need to edit FLAC files, look no further than Fission.

Crop It Out

Got a small portion of audio to save? Highlight it, click Crop and you're done.

File Joining

With a simple drag and drop or copy and paste, you can join two or more files into one.

Smart Split

Automatically split files based on silence. It's perfect for LP and DVD recordings.

Inline Gain Adjustment

Highlight a section of audio then adjust the gain with the Gain slider.

Cue Sheet Support

Split files using cue sheets, or export your edits to a cue sheet file.

Fade Away

Fade audio in and out to create pleasing transitions.

Why Be Normal?

Give audio files a constant volume level with the Normalize function.

Split Points

With Fission's Split Points, you can split and save to get multiple files.

Great Uses for Fission

Ringtone Feature Icon

Create iPhone Ringtones

Edit audio down, then choose “Save as iPhone Ringtone” to get custom tones for all your iOS devices.

Podcast Feature Icon

Edit Podcasts

Record a podcast with Audio Hijack, then edit it down in Fission.

iTunes Feature Icon

Edit Downloads

If you buy songs from Apple's Music Store, Fission can help losslessly edit them.

Remopve Commercials Feature Icon

Remove Commercials

Record a web stream, then trim out unwanted ads and other bits.

Split LP Feature Icon

Split Up LPs

Take one long file and split it into individual songs with Smart Split. Handy!


Get Fission

Note: While using the software in trial mode, limitations are applied. Purchase to unlock the full version.

For MacOS 11 to MacOS 14: Fission 2.8.5 October 2, 2023 Release Notes
Older version of MacOS? Learn more about Legacy versions of Fission.

What People Are Saying About Fission

MacWorld Logo
“[N]early every modern Mac user has a reason to muck with music…Rogue Amoeba gave us amateurs an easy, inexpensive way to edit our audio files”

“If you work with Audio Files - use Fission”

Kevin B.

“Personal recommendation: Go buy @RogueAmoeba's new version of Fission. It's even better than v1.”

Russell F.

MacWorld Logo
“Fission is likely the only app you need to work with audio files, and it does the job easily and quickly.”

“I'm in love with Fission from @RogueAmoeba! It's totally awesome and saves me a lot of time when editing band recordings”

Jöran A.

“Just to let you know that I love this piece of tech, easy to install, its so easy to use, great results, perfect! If only all software was this user friendly!”

John M.

MyMac Logo
“Highest praise to Fission, with thanks to our friends at Rogue Amoeba for such great utilities.”

“I smell a hit.”

John Gruber, Daring Fireball

“If you're looking for an elegant and easy-to-use lossless audio editing program on the Mac, check out Fission.”

Andrei M.

MacUser UK Logo
“Fission…is a straightforward, no-nonsense editor that does precisely what you need. Elegant and easy to use, it's the ideal companion to Audio Hijack.”

“I love Fission, by Rogue Amoeba. That's right, I said it. Do not judge the love between a man and this piece of powerful, yet simple to use, audio editing software.”

Scott McNulty

“I love @RogueAmoeba software! Audio Hijack and Fission are AMAZING applications.”

Alan R.

MacBreak Icon
If you've ever been in that position of having to edit an MP3 and not wanting to lose quality, Fission is the one.

“Fission is the one app I could not have done without over the last 3 years.”

Simon E.

“A great update to an already superb application. Well done!”

Rob W.

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