How do I convert MKV to M4B?

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

Is it safe to convert MKV to M4B here?

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

Is the MKV to M4B 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 MKV to M4B reduce quality?

M4B 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 MKV 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.

MKV→MP4 MP3→M4B MKV→MP3 MP4→M4B MKV→WebP WAV→M4B MKV→MOV MOV→M4B MKV→GIF M4A→M4B MKV→WAV WebM→M4B MKV→WebM MKV→M4A MKV→AVI MKV→FLAC MKV→AAC MKV→OGG MKV→WMV MKV→Opus MKV→M4V MKV→FLV MKV→MPEG MKV→3GP MKV→WMA MKV→TS MKV→MPG MKV→AIFF MKV→AMR MKV→VOB FLAC→M4B AAC→M4B AVI→M4B OGG→M4B WMV→M4B Opus→M4B WMA→M4B FLV→M4B M4V→M4B MPEG→M4B 3GP→M4B AIFF→M4B AMR→M4B MPG→M4B TS→M4B MTS→M4B VOB→M4B M2TS→M4B 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 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 GIF→AVIF AVIF→GIF SVG→GIF GIF→SVG WebM→WebP MOV→WAV XLSX→PDF CSV→PDF EPUB→PDF PDF→EPUB MOV→WebM WebM→MOV PNG→ICO JPG→ICO ICO→PNG ICO→JPG MP3→AAC WAV→M4A AAC→MP3 M4A→WAV MP4→FLAC AVI→MP3 MOV→MKV MOV→M4A DOCX→EPUB EPUB→DOCX CSV→DOCX PDF→TXT DOC→PDF TXT→PDF WebP→ICO ICO→WebP

MKVM4B

Convert MKV to M4B

Free and private: MKV files are converted in your browser on computers; on phones, in our fast cloud and deleted automatically.

In your browser (fast cloud on phones)
No watermark
Batch & ZIP download

Need a smaller MKV? Compress MKV

How to convert MKV to M4B

1
Add your MKV files
Drag and drop MKV files onto the converter, paste them, or click to browse. You can add several at once.
2
Choose M4B
M4B 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 M4B
Download each M4B file, or everything at once as a ZIP.

MKV vs M4B

From

MKV · Matroska Video

MKV is a flexible open container that can hold unlimited video, audio and subtitle tracks in nearly any codec.

Type: Video
Extension: .mkv
MIME: video/x-matroska
Best for: movies and series with multiple audio and subtitle tracks

Open standard

All MKV conversions →

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 →

MKV to M4B: frequently asked questions

Free, private and in your browser