MP3 to M4A Converter
Convert MP3 audio to M4A right in your browser. MP3 is the most widely-supported audio format, small and playable everywhere, while M4A is Apple's AAC-based audio format, efficient and high quality. Because conversion runs locally, your files never leave your device.
Drop audio or video files here or click to browse
Converted on your device. Nothing is uploaded. Large files run best on desktop.
How to convert MP3 to M4A
- Drop your MP3 file(s) into the box above, or click to browse.
- Choose M4A as the output and pick a bitrate.
- Click “Convert to M4A”. The first run loads the converter engine once, then it's cached.
- Download your M4A file — no watermark, no sign-up.
Frequently asked questions
Is this MP3 to M4A converter free?
Yes — completely free, no account, no watermark. The only limit is your device's memory, since everything runs locally.
Are my files uploaded to a server?
No. Your MP3 file is processed entirely in your browser using WebAssembly. It never leaves your device.
Will the quality change?
M4A is compressed, so you can choose a bitrate (192k is a good balance). Higher bitrate means better quality and larger files.
Can I convert large files?
Yes, but very large media uses a lot of memory. For big files, a desktop browser works best.