M4B – MPEG-4 Audiobook
M4B is an MPEG-4 audio file for audiobooks. It supports chapters and remembers where you stopped listening.
More M4B conversionsDrop your M4B files here
or click to choose M4B files · up to 95MB each
How to convert M4B to MP3
- Choose your files. Click Select File or drag your M4B files into the upload box. You can add many at once.
- Pick the settings. MP3 is already selected as the output format. The conversion starts as soon as a file is added.
- Download. Each file appears in the list when it is ready. Download them one by one, or all together with Download all.
MP3 – MPEG Audio Layer III
MP3 is the most widely supported lossy audio format. It makes music files small enough to share and plays on virtually every device.
More MP3 conversionsConverting M4B to MP3
- Your M4B file is converted on our server and the MP3 result can be downloaded straight away.
Frequently asked questions
How do I convert M4B to MP3?
Click Select File or drop your M4B file onto the upload box. The converted MP3 appears in the list below with a download button. You can add many files at once and download them together as a ZIP.
Is it really free?
Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Are my files stored?
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
Will quality drop?
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.
How this works: your file is uploaded over HTTPS and converted on this server with open-source engines (libvips for images, FFmpeg for audio and video, LibreOffice and Pandoc for documents, Calibre for ebooks, Ghostscript and Inkscape for PDF and vector files). Images are processed in memory; other files use a private temporary folder that is deleted as soon as the conversion finishes.