Open-sourced internal component of DeepSeek Harness (npm @deepseek-ai/libreoffice-kit + dsoffice CLI): Office-to-PDF export (OOXML + 97-2003 binary), spreadsheet recalculation, and page-by-page PNG rendering of Office/PDF inputs. Font-friendly = font discovery / preserve requested families / configurable fallbacks (Carlito for Calibri, Caladea for Cambria) / missingFonts reporting and budgets. Prebuilt engines for macOS ARM64/x64, Windows ARM64/x64 and Linux WASM bundle offline, with downloads slimmed 37-39%; no dependence on a user LibreOffice install.