Convert AAC to MP3
Convert AAC to MP3 right in your browser — free, private, nothing is uploaded. One-click re-encode for compatibility.
Convert AAC to MP3 →Free · Private — runs in your browser, nothing is uploaded
AAC is the codec behind M4A files, streaming services and much of broadcast audio; as a bare .aac stream it carries the same lossy audio without the MPEG-4 wrapper — and without proper tag support.
MP3 is the most widely supported audio format there is — a lossy codec that shrinks audio to a fraction of its uncompressed size and plays on virtually anything with a speaker.
Converting AAC to MP3 is a compatibility move: both formats are lossy, so the goal isn't quality — it's producing a file that fits sharing, podcasts and everyday listening. Expect the sound to stay essentially the same, with a small second round of encoding loss.
AAC vs MP3
| AAC | MP3 | |
|---|---|---|
| Compression | lossy — some detail traded for size | lossy — some detail traded for size |
| Codec / container | raw AAC (Advanced Audio Coding) stream | MPEG Layer III audio |
| Typical file size | small — similar to MP3 at the same bitrate | small — about 1.4 MB per minute at 192 kbps |
| Best for | streams, broadcast audio and recorder output | sharing, podcasts and everyday listening |
| Strength | modern lossy codec, efficient at every bitrate | plays everywhere; small files |
| Watch out for | bare .aac streams carry no metadata and trip up some players | lossy — encoding discards some audio detail to save space |
| Compatibility | the codec is everywhere, but fewer apps open bare .aac files | universal — effectively every device and app |
How the conversion works
- Choose your AAC file (up to 10 MiB). The button above opens the converter with MP3 already selected as the target format.
- Pick a bitrate between 32 and 320 kbps — the default 192 kbps is transparent for most material, and values outside the range are clamped.
- Run the conversion and download the result — the output keeps your filename with a .mp3 extension. Everything happens locally: the page runs ffmpeg compiled to WebAssembly, so your audio is never uploaded to a server.
What to expect
Generation loss stacks. Re-encoding lossy AAC audio with another lossy codec adds a second round of loss. Keep the MP3 bitrate at or above the original's and avoid repeated round-trips between formats.
Embedded album art is dropped along the way: cover images ride along as a video stream, which audio-only outputs like MP3 can't carry.
FAQ
Will converting AAC to MP3 make my audio sound worse?
Marginally, in principle: both formats are lossy, so the re-encode adds a second generation of loss. At 192 kbps or higher it's rarely audible, but keep the original AAC and avoid converting back and forth.
What bitrate should I pick for the MP3 file?
The converter accepts 32–320 kbps and defaults to 192 kbps, which is a good balance for music. Use 128 kbps for voice where size matters and 256–320 kbps for archiving; when re-encoding from AAC, match or exceed the source's bitrate to limit further loss. Values outside the range are clamped.
Is my AAC file uploaded when converting to MP3?
No. The page downloads an ffmpeg WebAssembly build once, then converts your file locally in the browser tab — the audio never leaves your device. Input files up to 10 MiB are supported.