You can insert a PDF into Google Slides by converting it into images or by creating the link to the same. The latter method is easy and lets you insert the entire PDF file into Google Slides.

You can insert a PDF into Word via the File, Open menu, which turns the PDF into an editable document, or as a non-editable image.

Need to edit a PDF document but don’t want to pay for the more expensive Adobe editors? You can add text to and sign a PDF with just the free Reader program.