How to convert MP3 to M4A (AAC)

Choose or drop one MP3 file up to 100 MB.
Select the output quality. The balanced default works well for most files.
Start the conversion and keep this tab open while the browser processes the audio.
Download the verified M4A (AAC) result.

What this conversion creates

The output is a real M4A (AAC) file encoded as AAC-LC. AudibleLite runs a bundled WebAssembly audio engine locally; it does not rename the extension or send your audio to an application conversion server.

When this format helps

M4A with AAC is useful for music libraries, mobile playback, and software built around the MP4 family.

The output is AAC-LC audio inside an M4A container—not a renamed MP3 file.

Quality and file-size limits

MP3 and AAC are lossy codecs, so transcoding may introduce additional quality loss.

Need the other direction? Convert M4A to MP3.

Open reverse converter

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Privacy note

The selected audio stays in this browser during conversion. The hosting provider may receive ordinary request information when it serves this page and the self-hosted engine files; it does not receive the audio through AudibleLite's conversion code. Read the privacy policy for details.