Free online MP3-to-M4B converter — upload a MP3 file and download a M4B. Fast, private, no signup.
Drop your MP3 file into the converter above — we auto-detect the real format from its bytes, convert it, and give you a M4B to download. No software to install.
Yes. Convert MP3 to M4B for free right in your browser, with no account needed to get started.
Your file is transferred over an encrypted connection and anonymous uploads are temporary. You can also view and strip metadata (location, device, author) before you download.
Ubiquitous lossy compressed audio. MPEG-4 audiobook (AAC, with chapter support).
Convert MP3 to: WAV · FLAC · M4A · AAC · AC3 · AIFF · M4R · OGG · OPUS · WV
Convert to M4B from: AAC · AC3 · AIFF · AMR · APE · FLAC · M4A · M4R · OGG · OPUS