Convert AAC to MP3
Some voice recorders, phone apps and radio broadcast recordings write audio as raw .aac files with no container. These files may lack duration information, and some players can't seek in them. Converting to MP3 fixes both.
Free · no sign-up · your file is processed in your browser and never sent to a server
No file handy? Try it with a 20-second Turkish meeting recording.
How to use
- Choose your AAC fileDrop one or more AAC files. On this page the tool only accepts AAC; for other formats, use the audio converter.
- Pick the qualityChoose the MP3 bitrate: 128 kbps for speech, 192–320 kbps for music.
- Convert and downloadFiles are processed one after another; each finished file comes with its own download link.
AAC and MP3 at a glance
| AAC | MP3 | |
|---|---|---|
| Codec | AAC (ADTS, no container) | MPEG Layer III |
| Type | Lossy | Lossy |
| Approx. size | 128 kbps: ~1 MB/min | 128 kbps: ~1 MB/min · 320 kbps: ~2.4 MB/min |
| Typical source | Some voice recorders and phone recorder apps, radio broadcast recordings | Music libraries, podcasts, recorder apps, almost every device |
Why convert?
- .aac recordings you can't seek in, or that show the wrong duration
- Programs that won't open .aac
- Archiving broadcast recordings
Common issues with AAC files
- Duration looks wrong: Raw AAC has no duration information; after converting to MP3 it displays correctly.
- Quality: Choose an MP3 bitrate equal to or higher than the source.
- If you need M4A: Choose M4A in the audio converter; the AAC is put into a container without re-encoding.
Privacy: your file never leaves your device
Everything happens in your browser. Your file is not sent to Voiser's servers or stored anywhere, and it's cleared from memory when you close the tab. That's also why the tool stays fast on a slow connection.
Common questions
Are AAC and M4A the same thing?
The codec can be the same: M4A carries AAC audio in an MPEG-4 container. An .aac file is the audio without a container.
Will the quality drop?
Lossy-to-lossy conversion costs a little; at 192 kbps and above the difference is usually inaudible.
Can I convert several files?
Yes, up to 10 files at a time.
Is my file uploaded to a server?
No. Your AAC file is converted in your browser; it isn't sent to Voiser or anywhere else, and it isn't stored.
Related tools
- Audio converterConvert files between MP3, WAV, M4A, OGG and FLAC.
- Extract audio from videoSave the audio track of your own videos as MP3, M4A or WAV.
- MP3 cutter and audio trimmerSelect any part of an audio file on the waveform and cut it out.
- Audio joinerMerge several audio files into one, in the order you choose.
Turn your converted recording into text.
Transcription turns speech into time-stamped text with separate speakers. Start with a free account.