Adobe Acrobat -

It allows for combining multiple files (like Word or image files) into a single PDF, as well as cropping or reordering pages.

The "Fill & Sign" tool enables users to add personal signatures or initials, while the Request E-signatures feature streamlines professional approval workflows. adobe acrobat

A paid version that includes essential editing, file conversion (to and from PDF), and basic e-signature capabilities. It allows for combining multiple files (like Word