it's free and i use it myself.because you've downloaded them an archived file though we can't really check it unless we where to download it and none of the comments say what they are.
also for pdf this is a lot better than adobe reader
i don't have a kindle so don't know.i just use it on my pc's but the page lists some things that it works with.
the kindle uses mobi i believe so you may be able to just move one and see but i have know clue.we have some kindle owners here and they could give better advice about that.
if you have big pdf files you could also drag them into the mobipocket reader an read it like a book,that's what i've done.
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