How do I convert M4B to MP3?

Drop your M4B file onto the converter above, make sure MP3 is selected, and click Convert. When it's done, download the MP3 file — it usually takes a few seconds.

Is it safe to convert M4B to MP3 here?

Yes. M4B to MP3 conversion happens entirely inside your browser using WebAssembly, so your file is never uploaded to any server.

Is the M4B to MP3 converter free?

Yes — free with no watermark. Signed-out visitors can convert 25 files a day, and a free account raises that to 250.

Will converting M4B to MP3 reduce quality?

MP3 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 MP3 back to M4B?

Yes — use our MP3 to M4B converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.

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

M4BMP3

Convert M4B to MP3

Free, fast and private. Your M4B files are converted right in your browser — nothing is uploaded.

Runs in your browser
No watermark
Batch & ZIP download

How to convert M4B to MP3

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 MP3
MP3 is already selected. Open Options if you want to change quality, size or metadata.
3
Convert
Click Convert. Your files are converted right in your browser in seconds.
4
Download your MP3
Download each MP3 file, or everything at once as a ZIP.

M4B vs MP3

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 →

MP3 · MPEG Audio Layer III

MP3 is the most compatible audio format in the world. Its lossy compression keeps music small enough to share while sounding close to CD quality.

Type: Audio
Extension: .mp3
MIME: audio/mpeg
Best for: music libraries, podcasts and audio for any device

Lossy compression

All MP3 conversions →

Need it the other way around? Convert MP3 to M4B.

M4B to MP3: frequently asked questions

Free, private and in your browser