Your question is not specific enough for anyone to answer.
It's certainly possible to extract text from a PDF and then make all sorts of changes to that text to transform it into the format you want.
Uploading that to a website - well it very much depends what you mean by that. There are all sorts of ways of putting text online. What is your desired way of doing this? It sounds like it's a very general IT question that is probably not really to do with R.
Please find out what you can about the work you are attempting. Make an attempt at doing it. The if you have specific problems or errors, you can ask about them here. It's always best to do something and then show what you've done before asking for help. Ideally you make a reproducible example.