Convert M4B to MP3
Convert M4B to MP3 online, free — no installation, no sign-up.
or drop files here to convert M4B → MP3
Max file size 1 GB. Browser-side conversions have no upload limit.
How to convert M4B to MP3
Add your file
Drop your M4B file above or click Choose Files.
Convert
We convert your file securely on our server over an encrypted connection.
Download
Grab your new MP3 file — done.
What is M4B?
M4B is the Apple audiobook format — AAC audio with chapter and bookmark support.
What is MP3?
MP3 is the universal lossy audio format, balancing small size with good quality.
Frequently asked questions
Drop your M4B file into the box above (or click Choose Files), then click Convert and download your new MP3 file. No account or software needed.
Yes — this converter is completely free with no watermarks and no sign-up.
Yes. Files are sent over an encrypted (HTTPS) connection and automatically deleted from our servers within an hour.
You control the output. Use the advanced options (the gear icon) to set quality, and we preserve as much fidelity as the MP3 format allows.