Convert AAC to MP3 online

Your AAC file is converted to MP3 right here in your browser, using FFmpeg compiled to WebAssembly. Nothing is uploaded to us, the audio never leaves your device. Quality is preserved and the download is ready in seconds.

What is an AAC file?

AAC (Advanced Audio Coding) is MP3's designed successor: at the same bitrate it preserves noticeably more detail, especially at the low bitrates where MP3 falls apart. It is the audio inside YouTube videos, M4A files and most streaming services.

AAC is everywhere modern media is: YouTube, iPhones, Android, streaming platforms. Raw .aac files are less common than AAC-inside-M4A, but they behave the same.

Why MP3?

MP3 (MPEG-1 Audio Layer III) is the format that made digital music portable in the late 1990s, and it remains the most universally supported audio format ever made. It compresses audio by discarding detail the ear is least likely to miss, at bitrates typically between 128 and 320 kbps.

Convert to MP3 when compatibility matters more than anything else, sending audio to someone whose device you don't know, uploading where only MP3 is accepted, or shrinking a large recording down to an email-friendly size. The rare weak spot is legacy hardware: very old players and some embedded systems only understand MP3 or WAV.

Frequently asked questions

Will converting AAC to MP3 lose quality?

A small, one-time generational loss is unavoidable. Both AAC and MP3 are lossy, so re-encoding discards a little more detail. The converter uses high-quality settings to keep it inaudible for speech, but if you still have the original uncompressed source, converting from that instead is always better.

Is it free?

Yes, completely, with no account and no watermark. The conversion runs on your own device, so it costs us nothing to let you use it. The only limit is file size: up to 50 MB, which is what a browser can hold in memory comfortably.

Do I need to install anything, or upload my file?

Neither. It runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio is never sent to us, which is also why it works on a slow connection, only the page downloads, not your file.

Need a transcript of the audio?

Autrans also transcribes audio in Nigerian English, Pidgin, Yoruba, Hausa, Igbo, French, and Spanish.