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One audiobook from a folder of MP3s.
Kataribe is for the audiobook that arrived as forty loose MP3s. Drop the folder in, order the tracks, name the chapters, add a cover and the title, author and narrator metadata, and it produces a single M4B that Apple Books, Audiobookshelf and most players treat as one book with proper chapter navigation. The muxing runs on ffmpeg compiled to WebAssembly inside the page, so nothing is uploaded and there is no size cap beyond your machine.
MP3 folder to a single chaptered M4B with cover art, title, author and narrator
ffmpeg.wasm in the browser — private by construction, no upload, no server
Chapter naming from filenames or ID3 tags, with reordering before you build
The studio agent helped architect this system — ask it anything.