Bulk M4R to AAC Converter Online — Free HD Quality
Drag and drop your multiple M4R files into this free online M4R to AAC converter (.m4r to .aac), and click the Convert button to bulk convert them to AAC format in HD quality. Use the quality slider to fine-tune your AAC output, then download your converted files one by one or as a single ZIP — your original M4R files are removed from our servers right after.
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PNG, JPG, WebP, GIF, HEIC, RAW, PSD, SVG and more
Max 100MB per file
M4R vs AAC — File Format Comparison
| Feature | M4R | AAC |
|---|---|---|
| File Extension | .m4r | .aac |
| MIME Type | audio/mp4 | audio/aac |
| Compression Type | Lossy | Lossy |
| Metadata Support | Yes | Yes |
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.
- Compression: Lossy
- Tags & Metadata: Supported
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.
- Compression: Lossy
- Tags & Metadata: Supported
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