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Convert an iPhone Voice Memo (M4A) to MP3

Convert an M4A or AAC file to a widely compatible MP3, in your browser.

Most tools run entirely on your device

Select an audio file

Your M4A/AAC audio is decoded and re-encoded as a widely compatible MP3 — in your browser.

Click to choose, or drop a file here

You can also paste (Ctrl+V / Cmd+V)

Most tools run entirely on your device

About converting M4A to MP3

M4A (used by Apple's ecosystem and many voice memo apps) isn't accepted everywhere MP3 is — MP3 remains the most universally compatible compressed audio format, which is the usual reason to convert.

The M4A is decoded to raw audio samples with the Web Audio API and re-encoded as MP3 at your chosen bitrate, entirely in your browser.

Supported files

Accepts M4A files. Produces an .mp3 file.

Is my file uploaded?

No. The M4A is decoded and the MP3 is encoded entirely in your browser with the Web Audio API — the file is never uploaded.

How to M4A to MP3

  1. 1

    Add the M4A

    Drop in an M4A or AAC file — it's decoded in your browser.

  2. 2

    Choose a bitrate

    Pick the MP3 bitrate you want.

  3. 3

    Download the MP3

    Save the widely compatible MP3.

M4A to MP3 — frequently asked questions

Does this work with iPhone voice memos?+

Yes — voice memos are M4A/AAC, which this decodes in your browser and re-encodes as MP3.

Is my file uploaded?+

No. Decoding and encoding both happen entirely on your device.

Will it play everywhere after converting?+

MP3 is the most universally supported audio format, so yes — anywhere M4A might be refused, the MP3 will play.

Any quality loss?+

Converting between two lossy formats adds a little loss. Pick 256–320 kbps to keep it minimal.

Do you upload my files to a server?+

No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The only exception is the AI tools, which send the extracted text (not the file) to Claude to do their work.

Is there a file size limit?+

There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.