Convert AAC to MP3

What is AAC?

AAC stands for Advanced Audio Coding. It replaced MP3 in many places because it sounds better at the same bitrate. YouTube, streaming radio, iTunes and most Apple audio use it. A file ending in .aac is a raw AAC stream, usually in the ADTS format, without the MP4 wrapper an .m4a file has.

Why convert AAC to MP3?

Not every player recognises raw .aac files. Car stereos, older MP3 players, some Windows apps and many upload forms expect MP3. An MP3 copy opens wherever you need it.

How to convert AAC to MP3

Drop the .aac files above and press Convert all. On Auto, the MP3 bitrate follows the source bitrate where it can be read. Set a fixed bitrate from 64 to 320 kbps in the options panel if you prefer. The files are decoded and encoded in your browser, and you can download each MP3 or all of them as a ZIP. AAC and MP3 are both lossy, so keep the source file where you can.

Before you start

Input: AAC. Output: MP3. The settings appear before anything runs, so you can check them first. Your original file is never changed.

Converting audio can change the codec, bitrate, channels, tags and length. Listen to the start and end of the result. Keep a lossless original if you may edit it again.

Keep the original until you have opened and checked the result. The work happens in this browser tab, so the size you can handle depends on your device's memory, your browser and the file itself.

Steps to convert AAC to MP3

1. Drop your .aac files above, or browse to select them.
2. Leave the bitrate on Auto or choose a fixed one.
3. Press Convert all. Everything runs in your browser.
4. Download each MP3 on its own or all of them as a ZIP.