MP3 to M4A Converter
Drop a file and get M4A back in seconds. Nothing is uploaded: the conversion runs on your own device.
MP3: The most compatible audio format, plays everywhere.
M4A: AAC audio in an MP4 container, used by iPhone voice memos and Apple Music.
The conversion runs inside your browser with WebCodecs, the video engine built into modern browsers. That is why there is no upload, no queue and no file size limit set by us: only your device's memory limits it. Your file stays private.
Have a link instead of a file? Get the audio straight from YouTube, Instagram or TikTok with the MP3 downloader.
Converter engine: Mediabunny (MPL-2.0) on WebCodecs. MP3 encoding: LAME (LGPL).
How it works
- Drop your file Or tap to choose it. It is read on your device, nothing is uploaded.
- Pick the options If the tool has any, for example quality or target size.
- Save the result Click Convert, wait for 100 %, then Save file.
FAQ
Does MP3 to M4A improve the quality?
No. It can't add detail that the MP3 doesn't have. It's useful when an app or device wants M4A.
Is my file uploaded?
No. The file is processed in your browser and never sent to our server.
Is there a file size limit?
We don't set one. Very large files need enough free memory on your device; a computer handles more than a phone.
Which browsers work?
Chrome and Edge on computers and Android work best. Safari works in recent versions. If your browser lacks a codec, the tool tells you.
Is it free?
Yes. No account, no watermark, no daily limit.