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.mp3.m4a
Convert MP3 to M4A (AAC)
Convert MP3 (.mp3) to M4A (AAC) (.m4a) for free, right in your browser. No upload, no sign-up: your files never leave your device.
About MP3 to M4A (AAC) conversion
This tool converts MP3 files to M4A (AAC) entirely on your device. The conversion runs locally in your browser using WebAssembly, so your audio files are never uploaded to a server.
MP3 is the most compatible lossy audio format, playable on virtually every device.
M4A is AAC audio in an MP4 container, the standard format for iTunes and Apple devices.