Pretend you are going to print the file. When selecting a printer, choose "Save as PDF" instead. Save it to your desktop or another easy-to-find location.

Alternatively, you can export the file as a PDF. Open the document and, under File (or "Archive" for Mac), select "Export (as PDF)." Finally, save it (choose "PDF" under Format).

If this doesn’t help, try the following:

Remove blank pages.

Reduce the file size.