Updated June 2026 · runs 100% in your browser
AAC to MP3
Convert AAC audio to MP3 on your device. No upload, no sign-up, no limits.
Drop AAC files here
or click to choose
🔒 Processed on your device · 0 bytes uploaded
First file loads the converter engine (~25 MB) — cached after that.
How it works
ConvertCabin loads a local copy of FFmpeg in this browser tab and converts on your device — nothing is uploaded. The first file downloads the engine (~25 MB), then it's cached.
It stays free, unlimited and private, and works offline once loaded.
About AAC to MP3
AAC is efficient but less universal than MP3; this converts it for maximum compatibility.
Frequently asked questions
How do I use AAC to MP3?
Drop AAC files and download the MP3s.
Is my file uploaded?
No. It is converted on your device by a local copy of FFmpeg and never uploaded.
What is an AAC file?
AAC (Advanced Audio Coding) is the successor to MP3, delivering better sound quality at the same bitrate. It's the default audio format for Apple devices, YouTube, and most streaming services.
What is an MP3 file?
MP3 is the most widely supported audio format. Its lossy compression shrinks audio to a fraction of the original size while keeping it perfectly listenable, which is why it became the standard for music.