As long as it's a Kindle Fire (2nd generation or newer), then you can just transfer the files by following these instructions:
http://www.amazon.com/gp/help/customer/display.html?nodeId=200375630
Anything older, or an original kindle, you can probably use the email transfer method you can find here:
http://www.amazon.com/gp/help/customer/display.html?nodeId=200767340#s2kemail
How do I view PDFs with a Kindle? - Knowledgebase / Tech Questions - Early to Rise Customer Support
How do I view PDFs with a Kindle?
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- Last updated: Oct 14, 2015 by Stephanie H