Optimizing pdf files for Kindle and Smartphone

If you have ebook reader like Amazon Kindle, Sony PRC or other (even for smartphone), sometimes it is confusing to read the paper, novel, or ebooks in those kinds of ebook reader. The better way is to convert the pdf files into kindle display size using k2opt given in the following link,

www.willus.com/k2pdfopt

How to use the command prompt. First, follow the instructions in that link how to install the program, then you can use the following command in Ubuntu and other Linux-based OS distribution,

k2pdfopt inputfile.pdf

For other option, you can choose after that command.
Here a sample of page conversion using k2pdfopt

Sample of conversion result using k2pdfopt (source: https://www.makeuseof.com/tag/how-to-optimize-pdf-for-kindle/)