reFlower

reFlower is a software application that aims at reshaping PDF files into a Kindle-friendly form. It makes PDF files readable on Kindle devices without changing the format of the original document.
The app is a GUI for k2pdfopt. The user interface is straightforward and you should be able to master this program in no time.
All adjustments have to be made prior to loading (“drag and drop” is not supported) the PDF file because the application starts processing the item right away.
You can select text orientation (portrait or landscape) and margins (small or big). It is also possible to straighten pages and if you open a PDF file and set the number of columns to as many as 4.
Additional options for reshaping PDF files include preparing your documents for Kindle DX, enabling OCR (optical graphic recognition) or processing it into a Native PDF.
It works fast with small PDFs. However, it might take some time to convert large PDF files. You can check the progress of the task in a progress bar.
You cannot choose an output destination and the converted files are saved in the same directory as the one with the files that were added for reshaping.
Compared to other similar apps, reFlower doesn't include many configuration settings and in this way you can effortlessly reshape PDF files.
In conclusion, reFlower is a small but efficient tool than can help you prepare your PDF files to be read on any Kindle device. Thanks to its overall simplicity and clean layout, it can be used by both novices and experts.