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hushvert

AAC converter

AAC converts to MP3 in your browser using WebAssembly, so the audio never leaves your device. Unlimited and free.

What is AAC?

AAC is the lossy audio codec that succeeded MP3, used by YouTube, the iTunes Store, and most streaming services because it sounds better at the same bitrate. It usually arrives in an .m4a or .aac file. Converting to MP3 trades a little efficiency for the format that plays on literally everything.

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Common questions about AAC

What is an AAC file?
AAC (Advanced Audio Coding) is the lossy audio codec that succeeded MP3 and powers most modern audio: YouTube, the iTunes Store, and the major streaming services use it because it sounds better than MP3 at the same bitrate. A raw .aac file holds AAC audio in an ADTS stream, though the same codec also shows up inside .m4a files. It is efficient and high quality, but a bare .aac is less universally accepted than MP3 by older players and upload forms.
How do I convert AAC to MP3?
Drop your .aac file into hushvert and choose MP3. The decode and re-encode happen entirely in your browser through WebAssembly, so the audio never uploads anywhere. It is free and unlimited with no account. This is the only conversion offered for AAC here: hushvert converts AAC out to MP3, not the other way around.
Is converting AAC to MP3 private? Does my file upload?
No upload. AAC to MP3 is a client-side conversion, meaning your file is read, decoded, and re-encoded on your own device. You can confirm it by switching to airplane mode or watching the Network tab while it runs, and there is a live demonstration on our /privacy-proof page. Nothing leaves your computer.
Will I lose quality converting AAC to MP3?
There is a small, usually inaudible change. AAC is already lossy, so going to MP3 means a second lossy encode rather than a copy of the original master. hushvert encodes to MP3 at a high bitrate, which keeps the difference negligible for speech and minor for music. If you want to avoid any added compression, the most faithful move is to keep the original AAC, but MP3 is the right choice when you need a file that plays on virtually anything.
Why would I convert AAC to MP3 instead of keeping it?
Compatibility. AAC sounds great, but a bare .aac file is rejected by some older car stereos, cheap media players, podcast tools, and web upload forms that only reliably accept MP3. Converting gives you a file that plays everywhere, at the cost of a small efficiency loss. If your players already handle AAC, there is no quality reason to convert.