Upload MP3 audio
Choose one or more non-empty .mp3 files up to 100 MB each.
MP3 audio to M4R
Encode MP3 audio into a new AAC M4R file.
Fileverses processes eligible MP3 files one at a time and creates audio-only fast-start M4R results from their first audio stream.
- AAC at 160k
- M4R via iPod muxer
- 100 MB per file
Processed by our self-hosted conversion engine
Supported files
MP3 in. AAC M4R out.
MP3M4R
The fixed FFmpeg profile decodes the first audio stream and writes a new fast-start M4R through the iPod muxer.
How it works
Prepare individual M4R results from MP3 uploads
Process sequentially
The browser sends one queue item at a time to the server-side fixed M4R profile.
Download and test
Save the separately named M4R files and verify them in the intended receiving workflow.
What is—and is not—made
An M4R file without audio editing or suitability checks.
AAC is newly encoded at 160k. The route does not trim content, guarantee device use, preserve tags, or restore MP3 detail.
Convert MP3 to M4RReadable MP3 audio only
Every source must be a non-empty .mp3 file no larger than 100 MB that host FFmpeg can read with audio.
First stream is used
The profile maps only the first audio stream and does not provide alternate-track selection.
AAC 160k M4R output
It writes a new audio-only, fast-start AAC-at-160k M4R through FFmpeg’s iPod muxer rather than copying MP3 data.
No duration or quality tools
Video, metadata, and chapters are removed. There are no trim, duration, bitrate, sample-rate, channel, or quality controls.
MP3 to M4R FAQ
M4R conversion answers
What does the MP3 to M4R converter output?+−
It outputs a new fast-start, audio-only M4R with AAC encoded at 160k from the first MP3 audio stream.
Does it copy the original MP3 into M4R?+−
No. Fileverses decodes the first stream and re-encodes it as AAC, so this is not a stream copy.
Will it make a ringtone-ready file?+−
It makes an M4R file but does not trim audio, set a duration, or guarantee suitability for any device or ringtone workflow.
How many MP3 files can I convert?+−
You can add eligible files to the queue; they are processed sequentially and receive separate downloads.
What are the MP3 upload requirements?+−
Files must be non-empty .mp3 uploads up to 100 MB, readable by host FFmpeg, with an audio stream.
Can conversion restore MP3 quality or guarantee size?+−
No. Re-encoding cannot restore information already lost to MP3 compression, and output size varies.
Are tags, chapters, and audio controls available?+−
No. Source metadata and chapters are removed, and no trimming, stream-selection, or output audio controls are available.