How to Convert M4R to AAC

Before you start

M4R is the ringtone format used by Apple devices. In many cases, an M4R file contains the same AAC audio data as an M4A file, with a different filename extension. Because of that, the conversion may not require re-encoding the audio. Check whether a file is an M4R created from an AAC source before choosing a re-encoding tool.

A local computer tool is usually the safest option for this task. If you choose an online converter, the file leaves your device and its handling depends on the service. Avoid uploading recordings that contain private speech or other sensitive audio to a service whose data policy you have not checked.

Step-by-step instructions

This procedure starts with a simple container change. Re-encoding is only needed if your target device or software still rejects the file after the extension is changed.

1) Locate the M4R file on your computer or connected phone. If you are using Windows and cannot see the extension, open File Explorer, select the View menu, choose Show, and enable File name extensions.

2) Copy the M4R file so you keep the original ringtone file unchanged. Work on the copy.

3) Rename the copied file from .m4r to .m4a. Windows may show a warning that changing the extension can make the file unusable; confirm the change only if you are working on the copy.

4) If the .m4a file plays normally, open it in a converter that supports AAC output. Select AAC as the output format and keep the original sample rate and channel count when those options are available. This avoids unnecessary quality loss.

Check the output

The converted file should play with the same duration as the source ringtone. Listen at the beginning and end of the clip, because ringtones are short and truncation at either boundary is easy to notice. If the destination supports it, confirm that the file is reported as AAC audio with the expected sample rate.

Common problems and next steps

If the renamed file does not play, the M4R may contain a format other than AAC. In that case, open the original M4R in a media information tool to see the actual codec before converting. If the output is larger than the source without a deliberate quality increase, reduce the AAC bitrate or check the encoder settings. If the new file is silent on one device but not another, test it in a different player and confirm whether the player supports the AAC profile that was used.