Convert AMR to M4B
Convert AMR files to M4B format online for free. No upload required, 100% private.
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AMRM4BRe-encoding
Converting between two lossy formats (AMR → M4B) involves re-encoding, which may cause additional quality loss. For best results, convert from the original source file when possible.
About AMR
AMR
Adaptive Multi-Rate Audio Codec
AMR is a speech audio codec optimized for voice recording. It is commonly used in mobile phones for voice memos and MMS messages.
Extension
.amr
Developed By
ETSI
Released
1999
Compression
LossyTypical Use Cases
Voice recordingMobile phone audioMMS messagesVoIP
Pros
- • Very small file size
- • Optimized for speech
- • Mobile device support
Cons
- • Poor music quality
- • Speech only
- • Limited compatibility
About M4B
M4B
MPEG-4 Audiobook
M4B is an audiobook format based on MPEG-4. It supports chapters, bookmarks, and is the standard format for iTunes and Audible audiobooks.
Extension
.m4b
Developed By
Apple Inc.
Released
2001
Compression
LossyTypical Use Cases
AudiobooksPodcasts with chaptersLong-form audio content
Pros
- • Chapter support
- • Bookmark support
- • Good compression
Cons
- • Limited to Apple ecosystem
- • Not universal
- • Requires specific players