Convert AAC to MP3
Bare AAC streams given a universal home — converted privately on your own device.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
A file ending in .aac is a raw AAC stream — audio without a proper container, the way broadcast recorders, some voice recorders, and stream-capture tools save it. Many players that happily play AAC inside an M4A refuse the bare stream: no container means no duration, no seeking, no metadata to hang playback on.
Converting to MP3 solves the compatibility question permanently — one file, playable on virtually every device and app that handles audio at all. The tool decodes the raw stream and re-encodes it at high quality in your browser; nothing uploads, and the result carries proper duration and seek support wherever it goes.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Why does my .aac file show no duration or refuse to seek?
Because it is a bare stream with no container index — players must guess its length. The MP3 produced here is a complete, indexed file: duration, seeking, and metadata all behave normally afterward.
Isn't AAC higher quality than MP3?
At equal bitrates AAC has the edge, but the high-quality MP3 encode used here keeps the difference inaudible for normal listening. What MP3 gives up in efficiency it repays in playing absolutely everywhere.
My recorder saves .aac — can I convert the files directly?
Yes, that is precisely the case this page handles: raw recorder output in, standard MP3 out, with no software installed and the recordings never leaving your device.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.