Compress to ZIP or RAR Our third suggestion on how to reduce a PDF’s file size is to add it to a ZIP or RAR archive.

Any help will be appreciated!” The quickest way to do this is to ZIP the PDF file and protect the ZIP file, or use Microsoft Office’s built-in encryption tools to create a password.

If you ever find yourself with the need to combine several PDFs into one single file, you may be immediately frustrated: It's not immediately obvious how to achieve what you're trying to do ...