Free online AAC-to-M4B converter — upload a AAC file and download a M4B. Fast, private, no signup.
Drop your AAC 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 AAC 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.
Advanced Audio Coding (lossy, MP3 successor). MPEG-4 audiobook (AAC, with chapter support).
Convert AAC to: MP3 · WAV · FLAC · M4A · AC3 · AIFF · M4R · OGG · OPUS · WV
Convert to M4B from: AC3 · AIFF · AMR · APE · FLAC · M4A · M4R · MP3 · OGG · OPUS