Turning forms into pdfs

Hello, can I work on the PDF of a form without changing the online form settings? I mean, I have this online form designed for web, with a lot of conditionals and hidden questions, that I want to export to a .pdf. But, I would like to change some things on the .pdf, so it becomes more easy to read, more beautiful, practical. Can I do this using the PDF form editor without changing what I did on the online form? How? 

A thing that happens that bothers me a lot is that the hidden questions don't appear on the pdf form if they aren't filled, ok, it's right. But the space in which they would be appears. In the end, I have lots os blank spaces on the page.

Yes, you can use our PDF editor and create the PDF form: https://www.jotform.com/fillable-pdf-form-creator/

Best way to do it is to select a form go More > Create PDF Form:

Also, please be mindful that not all features (and fields) will be available in PDF editor.

Regarding your second question, if you remove the fields from the form there shouldn't be any empty space.

What is the form you're working on?