AU to M4A Converter

Convert your au files to m4a online & free

Drop files here. 100 MB maximum file size or Sign Up
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Settings

Set the AAC audio bitrate per channel. For example, stereo audio with 128 kbps set here will produce a 256 kbps file. If set to "Custom", the recommended range is ≥64 kbps.
Set the number of audio channels. This setting is most useful when downmixing channels (e.g., from 5.1 to stereo).
Set the sample rate of the audio. Music with a full spectrum (20 Hz — 20 kHz) requires values not lower than 44.1 kHz to achieve transparency. More info can be found on the wiki.
Convert to AU

au

Sun Microsystems AU files

AU is a file extension for a sound file format belonging to Sun, NeXT and DEC and used in UNIX. The AU file format is also known as the Sparc-audio or u-law fomat. AU files contain three parts: the audio data and text for a header (containing 24 bytes) and an annotation block.
M4A Converter

m4a

Compressed Audio File

This is a lossless-format (and encoding algorithm) for Apple platforms. M4A is widely used in iPod players and as a component in QuickTime media-players. The m4a codecs decoder is found in open sources - this allows third party users to open files in that format.

How to convert AU to M4A

Step 1

Upload au-file(s)

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

Step 2

Choose "to m4a"

Choose m4a or any other format you need as a result (more than 200 formats supported)

Step 3

Download your m4a

Let the file convert and you can download your m4a file right afterwards

AU to M4A Quality Rating

4.3 (3 votes)
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