Convert AC3 to M4R
Convert AC3 files to M4R format online for free. No upload required, 100% private.
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AC3M4RRe-encoding
Converting between two lossy formats (AC3 → M4R) involves re-encoding, which may cause additional quality loss. For best results, convert from the original source file when possible.
About AC3
AC3
Dolby Digital Audio Codec 3
AC3 (Dolby Digital) is a surround sound audio format commonly used in DVDs, Blu-rays, and digital television broadcasting.
Extension
.ac3
Developed By
Dolby Laboratories
Released
1991
Compression
LossyTypical Use Cases
DVD audioBlu-rayDigital TVHome theater
Pros
- • Surround sound support
- • Industry standard for video
- • Good compression
Cons
- • Lossy compression
- • Requires licensing
- • Not for music distribution
About M4R
M4R
iPhone Ringtone Format
M4R is the ringtone format used by Apple iPhones. It is essentially an M4A file with a different extension, limited to 40 seconds for ringtones.
Extension
.m4r
Developed By
Apple Inc.
Released
2007
Compression
LossyTypical Use Cases
iPhone ringtonesiOS alert tonesCustom notification sounds
Pros
- • Native iPhone support
- • Easy to create from M4A
- • Good audio quality
Cons
- • iPhone only
- • 40 second limit
- • Requires iTunes for transfer