MP3 to M4A Converter - Free Offline (No Upload)
Convert MP3 audio files to M4A format offline in your browser. Choose bitrate. No upload, 100% private and free.
No Upload
100% Private
Free
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Loading Audio Processing Engine
Uses FFmpeg.wasm. First use downloads ~25MB (cached after).
Initializing...
Drop your MP3 files here
or click to select MP3 files
Converting: ...
Converted Files
Frequently Asked Questions
Why convert MP3 to M4A?
M4A is Apple's native format and offers better quality with smaller file sizes. Ideal for iOS devices and iTunes.
Does this MP3 to M4A converter work offline?
Yes. FFmpeg.wasm runs entirely in your browser. Your files never leave your device.
Is there a file size limit?
No server limit. Large MP3 files may take time to process depending on your device.