Paperless activity

Question

I'm currently developing a paperless system, the concept is that during operation the result will edit my base file (which is an excel template) dynamically and will be saved on a different folder. Right now I'm stuck because all the templates given to me was in pdf format. Is there a way to edit the pdf file directly?
In excel file I edit the specific cell I want to put the value on. Is that possible in pdf format file?

Answer 1

I find this question confusing. First it said the base file is an Excel file, then it said the base file is PDF. Which is it?
PDF editor:
https://acrobat.adobe.com/us/en/acrobat/how-to/pdf-editor-pdf-files.html
Companies pay for this ability. Re-engineering PDFs is tough (proprietary algorithm). So far I've only seen poor approximations available for free.

Answer 2

You will have to use a library that can read and write pdf format. What language?