epub-to-pdf-skill

Convert EPUB e-books to PDF using ebooklib + WeasyPrint with proper CJK font support.

EPUB → PDF

Convert .epub files to PDF. Works for Chinese/Japanese/Korean text.

Prerequisites

bash

apt-get install -y weasyprint
pip3 install --break-system-packages ebooklib beautifulsoup4 lxml

CJK fonts required:

• /root/.openclaw/workspace/skills/pdf-maker/NotoSansCJKsc.ttf
• /root/.openclaw/workspace/skills/pdf-maker/NotoSansCJKscB.ttf

Usage

bash

python3 scripts/epub2pdf.py <input.epub> <output.pdf>

How it works

1. ebooklib reads all ITEM_DOCUMENT entries from the EPUB
2. BeautifulSoup + lxml strips <script>, <style>, <link>, <meta> tags
3. Injects CJK fonts via @font-face CSS
4. WeasyPrint renders combined HTML to A4 PDF (2cm margins, justified)

Troubleshooting

Symptom	Fix
WeasyPrint import fails	apt-get install weasyprint
CJK characters garbled	Ensure font TTF path is correct (TTC collections won't work)
Empty / tiny PDF	EPUB has no readable document entries — check TNC count
calibre root sandbox error	Don't use calibre; use this script instead