A font name is not the font file
A DOCX or XLSX can request a typeface that is unavailable on the server. The Office renderer chooses a substitute with similar characteristics, but its character widths and glyph coverage can differ.
Look for predictable symptoms
Wider substitute glyphs cause line wraps, taller row heights and shifted page breaks. Missing symbol glyphs can appear as boxes. In spreadsheets, a small width change may push the final column to a new printed page.
Prepare a portable document
Prefer common open fonts such as Noto or Liberation when appropriate. Confirm licensing before embedding fonts, remove unnecessary font variants and save a reference PDF from the authoring system when visual fidelity matters.
- Check headings and narrow table columns.
- Inspect symbols, equations and non-Latin scripts.
- Compare page count before and after conversion.
- Keep a final approved PDF for fixed records.
Security and network behaviour
The isolated converter does not download missing fonts. Its network-disabled design is intentional: it prevents a document from fetching external resources during processing.
Use the relevant tools
These guides are general information, not legal, security or records-management advice. Follow your organisation’s policies for sensitive files.