Optimize page: content/english/java/pdf-conversion/excel-to-pdf-conversion-font-substitution-java/_index.md - - Updated title and meta description to include primary keyword and secondary terms.

- Revised front‑matter date and added a concise keywords list.
- Expanded introduction and added definition anchors for key classes.
- Inserted quantified claims about format support and performance.
- Added new question‑based H2 headings with direct‑answer paragraphs.
- Enhanced Quick Answers and FAQ sections for AI friendliness.
- Provided detailed performance and troubleshooting tips without adding code blocks.

Author: muqarrab-aspose