Convert AAC to MP3 online
Convert a AAC file to MP3 directly in your browser — the file is never uploaded to a server.
or click to select it
Convert a standalone AAC file — a raw .aac audio stream, not the M4A-wrapped AAC used by iTunes — into MP3, the format with the broadest hardware and software support.
Raw .aac files contain an ADTS audio stream without the MP4-style container that M4A files use, which is why some players and devices reject them outright even though they can play M4A or MP3 fine. This tool decodes the ADTS stream and re-encodes the audio as MP3 so it opens everywhere.
Use cases
- Open a raw .aac recording from an old digital voice recorder that your phone won't play.
- Convert .aac audio extracted from a broadcast stream into MP3 for a standard media player.
- Make an AAC file from professional recording software playable on devices without AAC decoding.
How it works
- 1
Upload your AAC file
Drop the file in or select it from your device.
- 2
Adjust the bitrate if you want
A high automatic quality is used by default; you can set a specific bitrate in the options.
- 3
Download the MP3
Once it's done, download the resulting file.
Technical details
Runs ffmpeg.wasm in your browser. AAC is technically a more efficient codec than MP3 — it generally sounds better at the same bitrate — but that efficiency doesn't help if the file format itself isn't recognized, which is the more common problem with plain .aac files than one of sound quality.
Frequently asked questions
Is AAC better quality than MP3?
At the same bitrate, yes — AAC is a more modern, efficient codec. The reason to convert to MP3 isn't quality, it's compatibility: far more devices and apps play MP3 out of the box.
Why won't my player open this .aac file if it plays M4A files fine?
M4A wraps AAC audio in an MP4 container that most players recognize; a raw .aac file is just the audio stream without that container, which some software doesn't parse.