PDF4Kindle: PDF to Kindle Conversion0
So you want to read your PDF documents on your Kindle but would like to convert them to native Kindle books? Now you can thanks to PDF4Kindle. This web-based tool converts PDF files into .mobi, so you can read them on your Kindle more conveniently. Calibre can do the same but you need to install the software.
In order to get started, just provide the tool with the URL of your PDF file or upload one. The app will take care of the rest for you. Since this is an online application, you can run it everywhere. You are still going to see some weird formatting issues when converting files but that is to be expected.[via]