What have I tried
I found many solutions that can convert PDFs and solutions that can create flipbooks but from HTML or other input.
I'm looking for a solution that allows me to create a site where users just upload their regular PDFs and those will be displayed as flipbooks so they don't have to convert the PDFs themselves.
The solutions doesn't have to be open source but it has to be free and shouldn't put any labels, popups, etc. that guides to a "full version".