Free online WMA to M4R converter

iPhones and ringtone-management software commonly require AAC audio in an .m4r file, while older Windows libraries and applications often contain .wma files. Converting the file makes the audio usable as a custom ringtone or in software that does not support WMA.

What the WMA format is

WMA (Windows Media Audio) is a Microsoft format used for compressed music, voice recordings, streaming, and local media libraries. Windows Media Player and older Windows applications commonly created or exported WMA files, so the format remains common in legacy collections.

WMA can contain lossy audio, lossless audio, or DRM-protected audio. A DRM-protected file generally cannot be converted by FFmpeg or a standard audio editor unless the licensed application provides an authorized export.

What the M4R format is

M4R is an MPEG-4 audio file identified by the .m4r extension. It normally contains AAC audio in an MP4-family container; M4R identifies a ringtone use rather than a separate audio codec.

The format is associated with iPhone ringtones and is usually compact enough for short notification sounds. The same AAC audio may be stored as .m4a for general playback. Renaming a WMA file to .m4r does not convert its codec or container.

Convert WMA to M4R online

1. Open the WMA-to-M4R converter on 101convert.com.
2. Upload the .wma file and select M4R as the output format.
3. Start the conversion and download the resulting .m4r file.
4. Import the file through the Apple-device or ringtone software you use. If the software rejects it, trim it to 30 seconds and convert again with standard AAC settings.

Online conversion requires uploading the recording, so use a desktop method for confidential audio or files subject to licensing restrictions.

Convert with FFmpeg

FFmpeg provides a desktop method for users who need local processing or batch conversion. Install FFmpeg from a trusted package source, place the WMA file in an accessible folder, and open Terminal or Command Prompt in that folder. To create a standard short ringtone, run:

ffmpeg -i input.wma -map 0:a:0 -map_metadata 0 -c:a aac -profile:a aac_low -b:a 256k -t 30 output.m4r

Replace input.wma and output.m4r with the actual filenames. The -t 30 option limits the output to 30 seconds; omit it when creating a longer file for an application that permits one. Select the desired excerpt before conversion when the original recording contains a long introduction.

For a smaller file, change the bitrate to 192k or 128k. A desktop audio converter can provide the same result without commands if it supports WMA input, AAC-LC output, and the .m4r extension. Choose AAC-LC, set a suitable bitrate, trim the audio if necessary, and export as output.m4r.

Quality and compatibility limits

Most WMA-to-M4R conversions are lossy-to-lossy transcodes. AAC cannot restore detail discarded when the WMA file was encoded, so use the highest-quality original and avoid repeated conversions. A bitrate of 192–256 kbps AAC is generally adequate for a ringtone; lower bitrates produce smaller files but may reduce quality.

Apple ringtone workflows commonly enforce a 30-second maximum, although the exact limit depends on the receiving application and device workflow. Standard AAC-LC in an MPEG-4 container is the safest output choice. Common sample rates such as 44.1 or 48 kHz and ordinary mono or stereo channel layouts are normally handled automatically, but unusual source parameters can cause an importer to reject the file.

If conversion fails, verify that the file is genuinely WMA rather than a renamed file, confirm that it is not DRM-protected, and try opening it in the licensed application that supplied it. Test the downloaded M4R in a compatible player before importing it to the phone.