How to use MP3 to M4A
- Choose a MP3 file.
- Click Convert to M4A and wait for processing.
- Download your new M4A file.
Private MP3 to M4A conversion
M4A/AAC offers better quality than MP3 at the same bitrate and is native to Apple devices.
Conversion is powered by FFmpeg compiled to WebAssembly and runs locally. The engine downloads once on first use, then your media is processed on your own device — nothing is uploaded.
- Is there a file size limit?
- The only limit is your device's memory, since processing happens in your browser rather than on a server.
- Are my files uploaded?
- No. Everything is processed locally in your browser, so your files never leave your device.