Now that I am on my own computer, I have looked a bit further at Zamzar. I've looked at the URL conversion possibilities and I've installed the Zamzar convert button on my browser. This was incredibly easy with Firefox. It all seems straightforward and useful.
I know there are often PDF files in websites that I would like to have in a more manipulable file type. Indeed on our own intranet there are many forms that I would like to convert so that I can fill them in on the PC, rather than having to print them off and handwrite responses. I can see that Zamzar will be my friend too!