Bulk AC3 to M4R Converter Online — Free HD Quality
Drag and drop your multiple AC3 files into this 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 — your original AC3 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
AC3 vs M4R — File Format Comparison
| 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.
- 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
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