M4B to AMR
Convert M4B to AMR. Upload .m4b and download an .amr file. The file must contain a playable, unencrypted stream. Damaged files and DRM-protected media cannot be converted. Keep the original until you have checked picture, sound and duration.
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Accepts: .m4b · Max 1GB · always free
Files are encrypted with TLS during upload and automatically deleted after conversion.
Choose your .M4B file to convert it to AMR.
Fast & Free
Convert files up to 1GB free with no account. Processing limits depend on the format and file contents.
Secure
Uploads use TLS encryption. Supported image conversions can run in your browser.
Check Your Result
Quality, transparency, and supported features depend on the output format. Keep your original file.
How to convert .M4B file to AMR
Upload Your File
Choose your .M4B file using the upload area. The maximum file size is 1GB; processing also depends on your device and the file's contents.
Check the Output Format
The target format is .AMR. Click Convert Now to start.
Download Your File
Download your .AMR file, open it to check the result, and keep your original.
About M4B to AMR
Content reviewed:
About your M4B input
The file must contain a playable, unencrypted stream. Damaged files and DRM-protected media cannot be converted. Keep the original until you have checked picture, sound and duration.
AMR output details
AMR output is narrowband mono audio at 8 kHz and 12.2 kbps. It is intended for speech and substantially reduces music fidelity.
Frequently Asked Questions
What file will M4B to AMR download?
The download uses the .amr extension. AMR output is narrowband mono audio at 8 kHz and 12.2 kbps. It is intended for speech and substantially reduces music fidelity.
What should I check before converting M4B?
The file must contain a playable, unencrypted stream. Damaged files and DRM-protected media cannot be converted. Keep the original until you have checked picture, sound and duration.
Where is my file processed?
Supported image conversions may run on your device. Other conversions upload to the conversion server. Server outputs are available temporarily and deleted after one hour. Keep your own copy of the result.