The best free PDF-to-Word converter is Word. Since 2013 it has converted PDFs natively: File, Open, done, all on your machine. Here is that walkthrough, the no-Word alternatives, and the honest part about why conversions are never pixel-perfect.
No Word license? Google Docs converts PDFs you upload to Drive into editable documents (honest caveat: that route does leave your machine, to Google, so weigh what is in the file). LibreOffice opens PDFs in Draw for lighter touch-ups, fully offline: details in the editing guide.
A converter site receives the entire contents of your document, by definition. Contracts, financials, HR paperwork, medical records: all of it lands on a server you know nothing about, run on a business model you cannot see. Some sites are honest. Some pay their bills with your data. Since Word converts locally and usually better, the online route is all risk and no upside for anything that matters.
PDF stores print layout: glyphs positioned on a page, not paragraphs and styles. Every converter, free or thousand-dollar, is reverse-engineering structure from a printout. Text-based PDFs come through well; scanned PDFs are photographs and need OCR first; intricate layouts will need cleanup. If the original Word or Docs file still exists somewhere, editing that is always cleaner than converting its PDF. And No Bloat PDF? It does not convert anything. It is the free 4.6 MB reader you check both ends of the conversion with, instantly.
Version 1.0.0 · Windows 10/11 (x64) · 4.6 MB · free forever
Signed, 4.6 MB, zero telemetry. Free forever.