Read PDF file in Kindle with Larger Text Size

The Kindle satisfies me when I'm reading a PRC-format book. However when it comes to PDF, the screen is too small to display the page. Even I rotate the Kindle, the text is still small to me. I notice that the margins of the PDF book is often large. So I think that why we don't make use of these margins and increase the text size. Below is my solution

1. You need to have a PDF virtual printer. You computer may  have "Adobe PDF" printer already. Otherwise I recommend PDFCreator.
2. Open your PDF book, print it and select your PDF virtual printer. In my case, I select PDFCreator. Then in "Page Sizing and Handling", select the "Custom Scale" and select the maximum percentage where your book is still displayed completely. For my example, I can select up to 150%. In other words, I just increase the text font size 1.5 times. On the right of the dialog, you can scroll the horizontal bar to check whether the page is not over the border of the page.

You can apply this technique not only Kindle but any device where the screen is not large. Make sure that the margin of the book you are reading is large enough. Otherwise the scaling up is not sufficient for you.