You can insert a PDF into Google Slides by converting it into images or creating a link to the same. This post covers both methods in detail.

While these programs cannot add links to current PDFs, you can create a document with an active link, then save the file as a PDF using these programs.

Click the "Hyperlink" option in the "Links" group to open the "Insert Hyperlink" window. Click "Existing File or Web Page" in the "Link to" section of the window.

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.

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.