AAC to MP3 Converter

Runs in your browser — your files are never uploaded.

AAC offers great quality at small file sizes, but MP3 remains the most universally playable audio format. OkConverter re-encodes your AAC file to MP3 entirely in your browser using a real copy of ffmpeg compiled to WebAssembly.

OptionsBitrate: Default — best quality for size

How to convert AAC to MP3

  1. 1

    Drop your AAC file onto the box, or click to choose one.

  2. 2

    OkConverter loads the conversion engine (one-time per session) and re-encodes it locally.

  3. 3

    Click “Download” to save the MP3.

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Frequently asked questions

Will I lose quality converting AAC to MP3?+

Both are lossy formats, so re-encoding sheds a little more data. OkConverter targets LAME VBR quality 2 (around 190 kbps), which is transparent for almost all listening — though converting an already-compressed AAC can’t add back detail it discarded.

Is MP3 or AAC better quality?+

At the same bitrate, AAC is generally a touch more efficient — but MP3 plays on far more devices, which is usually the reason to convert. At the ~190 kbps this tool uses, the difference is inaudible to most listeners.

How is this different from the M4A to MP3 converter?+

M4A is a container that almost always holds AAC audio inside it; this tool accepts a bare .aac elementary stream directly. Both re-encode to MP3 the same way.

Is my file uploaded anywhere?+

No. Once the engine has loaded, decoding and re-encoding both happen entirely inside your browser tab.

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