M4R to AU Converter
Convert your m4r files to au online & free
How to convert m4r to au
Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.
Choose "to au"
Choose au or any other format you need as a result (more than 200 formats supported)
Download your au
Let the file convert and you can download your au file right afterwards
MPEG 4 Ringtones Audio
M4R - is a digital multimedia container format used to store audio in mono channel mode. This format is suitable for store ringtones and it is widely used by Apple iPhone for its ringtones. Needless to say that M4R and M4A formats shares many similar features.
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.