As a post-grad student, I have to read a lot of PDF documents and I tend to do a lot of highlighting while reading and them process these highlights with a speciallized software (Docear). However, in order to use these highlights effectively, I needed a tool to extract the text from these highlights and embed the text as the highlight comment. PDF Hihglight Extractor is a very simple tool that does this. I publish it because I know that there are a lot of poor soul out there facing the same problem. I hope this helps.
If PDF Highlight Extractor made your life easier in any way, please consider a donation to the developer of the tool. Alternatively, you can also use the following links to make your usual shopping in Amazon and I'll get a tiny bit back from the sales. It does not cost you a penny and it helps support the app!