How do I convert M4B to AMR?

Drop your M4B file onto the converter above, make sure AMR is selected, and click Convert. When it's done, download the AMR file — it usually takes a few seconds.

Is it safe to convert M4B to AMR here?

Yes. Your file is sent over an encrypted connection to an isolated sandbox that's created for your job only, then both the original and the result are deleted automatically.

Is the M4B to AMR converter free?

Yes. Cloud conversions like this one use credits, and you get free credits every day (3 without an account, 10 with a free account).

Will converting M4B to AMR reduce quality?

AMR is a lossy format, but our defaults are tuned to be visually indistinguishable for most files. You can raise the quality under Options.

Can I convert multiple M4B files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, then download them individually or as a single ZIP.

Can I convert AMR back to M4B?

Yes — use our AMR to M4B converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.

AMR→M4B M4B→MP3 MP3→AMR M4B→WAV MP4→AMR M4B→M4A WAV→AMR M4B→FLAC MOV→AMR M4B→AAC M4A→AMR M4B→OGG M4B→Opus M4B→WMA M4B→AIFF M4B→AC3 M4B→MP2 M4B→WEBA M4B→OGA M4B→MKA M4B→WV M4B→AU M4B→TTA WebM→AMR FLAC→AMR MKV→AMR AAC→AMR AVI→AMR OGG→AMR WMV→AMR Opus→AMR WMA→AMR FLV→AMR M4V→AMR MPEG→AMR 3GP→AMR AIFF→AMR MPG→AMR TS→AMR MTS→AMR VOB→AMR M2TS→AMR PNG→JPG JPG→PNG PNG→WebP JPG→WebP WebP→PNG WebP→JPG HEIC→PNG HEIC→JPG MP4→MP3 PNG→JPEG JPG→JPEG JPEG→PNG JPEG→JPG PNG→PDF JPG→PDF PDF→PNG PDF→JPG HEIC→WebP MP4→WebP PDF→DOCX DOCX→PDF JPEG→WebP WebP→JPEG PNG→GIF JPG→GIF GIF→PNG GIF→JPG MP4→MOV MOV→MP4 WebP→PDF HEIC→JPEG WebP→GIF GIF→WebP HEIC→PDF MP3→WAV WAV→MP3 JPEG→PDF PDF→JPEG SVG→PNG SVG→JPG HEIC→GIF MOV→MP3 MP4→GIF GIF→MP4 JPEG→GIF GIF→JPEG PNG→AVIF JPG→AVIF AVIF→PNG AVIF→JPG MP3→M4A M4A→MP3 GIF→PDF SVG→PDF PNG→SVG JPG→SVG PDF→SVG SVG→WebP MOV→WebP MP4→WAV MP4→WebM WebM→MP4 WebP→AVIF AVIF→WebP WebP→SVG SVG→JPEG MP4→MKV MKV→MP4 HEIC→AVIF MP4→M4A JPEG→AVIF AVIF→JPEG JPEG→SVG MOV→GIF GIF→MOV WebM→MP3 AVIF→PDF MP3→FLAC FLAC→MP3 MP4→AVI AVI→MP4 MKV→MP3 GIF→AVIF AVIF→GIF SVG→GIF GIF→SVG WebM→WebP MOV→WAV XLSX→PDF CSV→PDF EPUB→PDF PDF→EPUB MOV→WebM WebM→MOV MKV→WebP PNG→ICO JPG→ICO ICO→PNG ICO→JPG MP3→AAC WAV→M4A AAC→MP3 M4A→WAV MP4→FLAC AVI→MP3 MOV→MKV MKV→MOV MOV→M4A DOCX→EPUB EPUB→DOCX CSV→DOCX PDF→TXT DOC→PDF TXT→PDF WebP→ICO ICO→WebP PPTX→PDF AVI→WebP

M4BAMR

Convert M4B to AMR

Free and secure. M4B files are converted in an isolated cloud sandbox and deleted automatically.

Isolated cloud sandbox
No watermark
Batch & ZIP download

How to convert M4B to AMR

1
Add your M4B files
Drag and drop M4B files onto the converter, paste them, or click to browse. You can add several at once.
2
Choose AMR
AMR is already selected. Open Options if you want to change quality, size or metadata.
3
Convert
Click Convert. Files are processed in a secure cloud sandbox and are usually ready in seconds.
4
Download your AMR
Download each AMR file, or everything at once as a ZIP.

M4B vs AMR

From

M4B · MPEG-4 Audiobook

M4B is an MP4 audio file flagged as an audiobook, supporting chapters and resume position.

Type: Audio
Extension: .m4b
MIME: audio/mp4
Best for: audiobooks on Apple Books and other players

Lossy compression

All M4B conversions →

AMR · Adaptive Multi-Rate

AMR is a speech codec used by mobile phones for voice recordings and calls.

Type: Audio
Extension: .amr
MIME: audio/amr
Best for: voice recordings from older phones

Lossy compressionLegacy format

All AMR conversions →

Need it the other way around? Convert AMR to M4B.

M4B to AMR: frequently asked questions

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