Convert AAC to MP3
The bare stream, in the container everything reads.
Drop files here
or click to choose from your deviceAccepted: AAC, ADTS
Up to 3 files per runUp to 150 MB per file5 runs per dayRemove limits with Pro✓ Works offline
Your files stay on your device
This tool runs entirely in your browser. Nothing is uploaded, nothing is stored, and you can even turn off your internet connection before you start.
Example
Worked example — AAC to MP3
Use the following inputs and settings.
| Item | Value |
|---|---|
| Input | tone.aac |
| Output files | 1 |
| Output | tone.mp3 |
| Output | 4.08 s |
Expected result — Output files: 1.
How it works
- Drop the .aac files on the box.
- Choose a bit rate — 192 or higher if it is music.
- Press convert.
- Download the MP3s.
Frequently asked questions
- What is a bare .aac file?
- An AAC stream with no container around it, usually in the ADTS framing that broadcast and streaming use. It turns up from stream recorders, some dashcams and a few older phones. Because there is no container, a lot of players will not touch it even though they can decode AAC perfectly well inside an .m4a.
- How is this different from M4A?
- Same codec, different wrapper. An .m4a is AAC inside an MP4 container, which carries the duration, the tags and the seek table. A bare .aac has none of that, which is why the length sometimes shows as wrong or unknown before you convert it.
- Does converting lose quality?
- It is a second lossy encode, so a little. Choose a bit rate at or above the source's to keep it from showing; if you do not know the source's, 192 kbps is a safe floor for music.
- Are the title, artist and cover art kept?
- Only if the .aac file starts with an ID3 tag, as some downloads and podcast files do: that tag is copied into the MP3 as it is. A bare .aac from a recorder usually has none, so its MP3 has none either; add them in your player or in something like Mp3tag.
- What are the free limits?
- Three files per run, 150 MB per file and 5 runs a day. Pro removes all three.