How to Convert MP3 to M4B Online?


Add MP3 file(s) that you want to convert.


Select M4B as the output format you want to convert MP3 file(s) to.


Click CONVERT to convert your MP3 file(s).


Click DOWNLOAD to save your converted M4B file(s).

Differences Between Our Online and Desktop Converters

online converter

Online Converter

  • Long-time wait
  • Up to 100MB file size
  • Popular formats supported
  • A muximum of 2 files in one conversion
  • Slow conversion speed
fast desktop converter

Faster Desktop Converter

  • 0 second wait
  • No size limits
  • 1000+ formats supported
  • Limitless batch conversion mode integrated
  • 30X faster than any converter

MP3 to M4B

Using Online UniConverter (originally, it's easy to convert MP3 files to a variety of other formats.

MP3 to M4R (MPEG-4 Audio format for Ringtones)

MP3 to AAC (Advanced Audio Coding)

MP3 to M4A (Compressed Audio File)

MP3 to FLAC (Free Lossless Audio Codec)

MP3 to M4B (MPEG-4 Audio Book File)

MP3 to AMR (Adaptive Multi Rate)

MP3 to AAX (Amazon Audible)

MP3 to AU (Sun Microsystems AU files)

MP3 to AC3 (AC3 Audio File)