Hi,
no it isnt possible to use any kind of SW to simply convert a non-responsive page to responsive, at least not in a 100% functional/nice looking way. Making a non-responsive site responsive usually takes longer than designing a responsive website from scratch. Things that need to be taken into account are - the way the menu/navigation works, the way the elements are programmed (for example, very often non-responsive pages use hidden tables to align elements on the website. Tables however cannot for example overflow "below". So imagine you have two elements next to each other. On a phone the screen is narrow so you want them to be on top of each other instead, but if they are in table cells, this isnt possible, you would need to make columns into rows and it all gets very complicated. It also heavily depends on the way you use CSS.