How do I convert RMVB to M4B?

Drop your RMVB 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 RMVB to M4B 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 RMVB to M4B 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 RMVB 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 RMVB 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.

RMVB→MP4 MP3→M4B RMVB→MP3 MP4→M4B RMVB→WebP WAV→M4B RMVB→MOV MOV→M4B RMVB→GIF M4A→M4B RMVB→WAV WebM→M4B RMVB→WebM RMVB→MKV RMVB→M4A RMVB→AVI RMVB→FLAC RMVB→AAC RMVB→OGG RMVB→WMV RMVB→Opus RMVB→FLV RMVB→M4V RMVB→MPEG RMVB→3GP RMVB→WMA RMVB→MPG RMVB→TS RMVB→AIFF RMVB→AMR FLAC→M4B MKV→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 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

RMVBM4B

Convert RMVB to M4B

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

Isolated cloud sandbox
No watermark
Batch & ZIP download

How to convert RMVB to M4B

1
Add your RMVB files
Drag and drop RMVB 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. Files are processed in a secure cloud sandbox and are usually ready in seconds.
4
Download your M4B
Download each M4B file, or everything at once as a ZIP.

RMVB vs M4B

From

RMVB · RealMedia Variable Bitrate

RMVB is the variable-bitrate version of RealMedia, once common for sharing TV series.

Type: Video
Extension: .rmvb
MIME: application/vnd.rn-realmedia-vbr
Best for: older shared video files

Legacy formatProprietary

All RMVB 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 →

RMVB to M4B: frequently asked questions

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