Converting from EPUB
EPUB is unpacked stream-wise; XHTML chapters and metadata are extracted without sending the book to a server.
Output as PDF
Text is laid out into PDF pages with embedded fonts for Cyrillic and CJK when needed. This is a content PDF, not a pixel-perfect replica of the source layout.
All conversion runs locally in your browser via Web Workers. Your files are not sent to any server, which makes ydoconv suitable for confidential documents, drafts, and large batches.