Bulk AAC to M4R Converter Online — Free HD Quality
Drag and drop your multiple AAC files into this 100% free online AAC to M4R converter (.aac 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 AAC files are removed from our servers right after. Also see:Free online AMR to MP3 tool.
Drop your AAC files here to convert to M4R, or click to browse
Converts .aac to M4R (.m4r) in HD quality — bulk, free, no signup
Choose FilesAAC vs M4R — File Format Comparison
See how AAC and M4R compare across file extension, MIME type, compression, and feature support. Related:Export MIDI as iPhone Audio.
| Feature | AAC | M4R |
|---|---|---|
| File Extension | .aac | .m4r |
| MIME Type | audio/aac | audio/mp4 |
| Compression Type | Lossy | Lossy |
| Metadata Support | Yes | Yes |
What Is AAC Format?
Advanced Audio Coding — the successor to MP3 adopted by Apple, YouTube, and mobile platforms; delivers better quality than MP3 at the same bitrate, especially below 128 kbps. See also:WAV to CAF converter.
- 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:RMI to ALAC conversion.
- Compression: Lossy
- Tags & Metadata: Supported