No account needed for a one-off conversion
Converting a single PDF to Word — a contract you need to redline, an old resume you're updating — doesn't warrant creating and remembering yet another account. PrivaPDF's free tier handles this without one: 5 conversions a day, no email, no password to set.
An account is only useful if you're converting regularly enough to want the Pro plan's unlimited daily conversions, not a prerequisite for using the tool at all.