Word to PDF on FiloPDF extracts DOCX text with Mammoth, lets you edit the plain text, then builds a PDF locally.
Complex Office layouts (columns, floating images, mail merge) will simplify. For pixel-perfect branding decks, keep Word or use a desktop export.
For the reverse trip - PDF text into something Word can open - use PDF to Word. Both stay private in the tab.
Related tool: Open word to pdf