Change fonts

[HelenaDemuynck]

How can I change the font of a complete pdf document? So not of a selection. I want to change the font of a 425 page document, so it has to happen all at once.

I can not convert it to Word, do the changes, and convert to pdf again, because it has been formatted for print. So I need to make the changes in the pfd. 

Thanks for helping me out!

[try67]

Not possible. PDF files were not meant to be edited in such an extensive way. You really need to do it in the original file, and then create a new PDF. If you made changes to the PDF that's a problem. You will need to re-do those changes in the original file. Or you could export the PDF to another format, make the changes there, and then create a new PDF file.