Convert M4A to MP3

Extracts the audio from an MPEG-4 container and re-encodes it as MP3.

What to expect

M4A usually holds AAC, so this is a lossy-to-lossy conversion into a less efficient codec.

Why convert M4A without uploading

Most online converters take your file, send it to their servers, convert it there and hand back a download link. That means your document sits on someone else's disk, subject to their retention policy and their breaches. It also means you cannot use them offline, and cannot use them at all for anything confidential.

frogConvert does the conversion in the page itself, with FFmpeg compiled to WebAssembly. There is no upload step because there is no server. You can disconnect from the network and it still works.

About the formats

M4A

An MPEG-4 container holding audio only, normally AAC and sometimes Apple Lossless. The extension describes the box, not the codec inside it. More about M4A files.

MP3

The format that made digital music portable, using perceptual coding to throw away sound judged inaudible. Universally supported and comfortably outperformed by every codec designed since. More about MP3 files.

Common questions

Is my file uploaded when converting M4A to MP3?

No. The conversion runs entirely in your browser. The file never leaves your device, there is no server to upload to, and the page works offline once loaded.

Is M4A to MP3 conversion free?

Yes, with no account, no watermark and no file limit per day. frogConvert is open source and there is no server cost to recover, because your device does the work.

How large a file can I convert?

Up to 2 GB for a single file, 500 MB total per batch, and 300 files at once. The practical limit is your device's memory, since everything is processed locally.

What is lost converting M4A to MP3?

M4A usually holds AAC, so this is a lossy-to-lossy conversion into a less efficient codec.