Bulk AC3 to M4R Converter Online — Free HD Quality
Drag and drop your multiple AC3 files into this 100% free online AC3 to M4R converter (.ac3 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 AC3 files are removed from our servers right after. Also see:Convert M4A to iPhone Audio.
Drop your AC3 files here to convert to M4R, or click to browse
Converts .ac3 to M4R (.m4r) in HD quality — bulk, free, no signup
Choose FilesAC3 vs M4R — File Format Comparison
See how AC3 and M4R compare across file extension, MIME type, compression, and feature support. Related:Convert AC3 to AIF free.
| Feature | AC3 | M4R |
|---|---|---|
| File Extension | .ac3 | .m4r |
| MIME Type | audio/ac3 | audio/mp4 |
| Compression Type | Lossy | Lossy |
| Metadata Support | No | Yes |
What Is AC3 Format?
Dolby Digital AC-3 — Dolby's multi-channel surround sound codec used in DVD, Blu-ray, and broadcast television; commonly encountered when extracting audio tracks from home theatre content. See also:Transform AC3 to CAF.
- Compression: Lossy
- Tags & Metadata: Not 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.
- Compression: Lossy
- Tags & Metadata: Supported