Bulk M4B to AMR Converter Online — Free HD Quality
Drag and drop your multiple M4B files into this free online M4B to AMR converter (.m4b to .amr), and click the Convert button to bulk convert them to AMR format in HD quality. Use the quality slider to fine-tune your AMR output, then download your converted files one by one or as a single ZIP — your original M4B files are removed from our servers right after.
Drop images here or click to browse
PNG, JPG, WebP, GIF, HEIC, RAW, PSD, SVG and more
Max 100MB per file
M4B vs AMR — File Format Comparison
| Feature | M4B | AMR |
|---|---|---|
| File Extension | .m4b | .amr |
| MIME Type | audio/mp4 | audio/amr |
| Compression Type | Lossy | Lossy |
| Metadata Support | Yes | No |
What Is M4B Format?
MPEG-4 Audiobook — AAC audio in an MP4 container with bookmarking support, the standard format for audiobooks on Apple Books, Audible exports, and iPhone podcasts.
- Compression: Lossy
- Tags & Metadata: Supported
What Is AMR Format?
Adaptive Multi-Rate — the standard voice codec for GSM and UMTS mobile networks, used in phone call recordings and voice messages; delivers compact files optimised for speech at 8 kHz.
- Compression: Lossy
- Tags & Metadata: Not supported
Related Converters
- AC3 to PCX - free, no signup
- Mass AMR to PGM conversion
- Get BMP from GIF
- How to batch convert JPS to JPG?
- K25 to TGA conversion
- Convert M4A files in bulk to TGA
- MIDI to ALAC conversion
- Save MOS as PDF
- How to turn MP1 into TGA?
- Convert OPUS files to AIF in queue
- Change Raw Audio to CUR
- Convert SVG to DDS free
- How to convert WMA to JPG online?
- Change XPM files to WEBP
- M4B format converter hub
- More AMR conversions
- Audio conversion tools
- Browse all converters