Private AAC conversion
AAC to M4R Converter
Repackage and encode AAC audio as an Apple-compatible M4R ringtone file entirely in your browser.
The processing engine downloads once from a CDN. Your AAC file stays on this device.
How to use the aac to m4r converter
- STEP 1Choose an AAC audio file up to 200 MB.
- STEP 2Convert it locally to M4R with FFmpeg WebAssembly.
- STEP 3Download the finished M4R file.
About this tool
M4R is an MPEG-4 audio container commonly used for Apple ringtone files. This tool creates the correct container and AAC audio stream.
Some devices impose ringtone-duration limits; this converter retains the source duration and does not automatically trim it.
Conversion time and memory use depend on the source duration, bitrate, and your device.
Frequently asked questions
Will the M4R automatically appear as a ringtone?
You still need to transfer or sync the downloaded M4R through the method supported by your device. The converter creates the file but does not install it.
Is the AAC file uploaded?
No. FFmpeg WebAssembly runs the conversion in your browser. The processing engine is downloaded from a CDN, but your media stays on your device.
Is there a file-size limit?
Yes. The tool accepts AAC files up to 200 MB. Larger files can exceed browser memory limits.