Bulk MP3 to M4R Converter Online — Free HD Quality
Drag and drop your multiple MP3 files into this 100% free online MP3 to M4R converter (.mp3 to .m4r), and click the Convert button to bulk convert them to M4R format in HD quality. Use the quality slider to fine-tune your M4R output, then download your converted files one by one or as a single ZIP — no signup and no downloads needed, and your original MP3 files are removed from our servers right after. Also see:Convert MP3 files to WAV in queue.
Drop your MP3 files here to convert to M4R, or click to browse
Converts .mp3 to M4R (.m4r) in HD quality — bulk, free, no signup
Choose FilesMP3 vs M4R — File Format Comparison
See how MP3 and M4R compare across file extension, MIME type, compression, and feature support. Related:Queue M4B to MP3 conversions.
| Feature | MP3 | M4R |
|---|---|---|
| File Extension | .mp3 | .m4r |
| MIME Type | audio/mpeg | audio/mp4 |
| Compression Type | Lossy | Lossy |
| Metadata Support | Yes | Yes |
What Is MP3 Format?
MPEG-1 Audio Layer III — the world's most popular compressed audio format, balancing sound quality with small file sizes for music streaming, downloads, and portable devices. See also:Queue FLAC to ALAC conversions.
- Compression: Lossy
- Tags & Metadata: Supported
What Is M4R Format?
iPhone Ringtone — AAC audio in an MP4 container under 40 seconds, the format iTunes and iPhone use for custom ringtones; identical to M4A in encoding but recognised by iOS as a ringtone file. You might also need:Convert AAC to AMR.
- Compression: Lossy
- Tags & Metadata: Supported