Free online FB2 to OGG converter

FB2 is an ebook, not an audio file, so a device or player that accepts OGG audio needs the book converted through text-to-speech. The result is spoken narration, not a copy of an existing recording.

What FB2 is

FB2 (FictionBook 2) is an XML-based ebook format that stores a book’s text, structure, and metadata. It is used for novels and other electronic books, and is commonly found in ebook libraries or produced with FictionBook editors and ebook tools such as Calibre.

What OGG is

OGG is a container for audio; Ogg Vorbis is a common lossy audio format stored in it. OGG is useful when a player or application supports Vorbis audio. To make an OGG file from FB2, a text-to-speech voice must first read the book, then the resulting audio is encoded.

How to convert FB2 to OGG

Online on 101convert.com

1. Upload the FB2 file on the 101convert.com converter page. Multiple files can be processed as a batch; the page shows the per-file size limit.
2. Before converting, choose the voice language and reading speed.
3. Start the conversion and download the resulting OGG file.

Offline with desktop software

For a local conversion, use Calibre to extract the book text, eSpeak NG to synthesize speech, and FFmpeg to encode the audio. These tools are available for Windows, macOS, and Linux.

1. Convert the book to plain text with Calibre’s command-line tool: ebook-convert book.fb2 book.txt.
2. Generate a WAV file with an installed eSpeak NG voice. Replace en with the appropriate voice code: espeak-ng -v en -f book.txt -w speech.wav.
3. Encode the WAV as Ogg Vorbis with FFmpeg: ffmpeg -i speech.wav -c:a libvorbis -q:a 5 book.ogg. Adjust the quality value if needed; higher values produce larger files.

Quality and limitations

The spoken result depends on the selected TTS voice and reading speed; FB2 formatting, images, and page layout do not become audio. Check that the voice language matches the book, and listen to the output because names and abbreviations may be pronounced incorrectly.