How To Annotate PDF Online?
Easy-to-use PDF software
Is there any way to search within PDF annotation and/or notes?
Really good question. Unfortunately right now I only have a partial answer. There are public domain programs that can extract text from PDF. Not sure about annotations. You can try it and see if you can pick out what you want with a search engine or script. One such program is PDF2Text. Download PDF2Text Pilot from SourceForge. (SourceForge vets its SW, while nothing is guaranteed, I have yet to have problems with this site.) One of the Linux utilities, say grep, is a good text search engine. The instructions on how to install Linux (UNIX) utilities are contained here. How does the "Linux Subsystem for Windows" sound to you? Do a web search on how to use grep, the combination of grep and PDF2Text might save you a lot of work.
Annotate PDF: All You Need to Know
That's the project site. You need to sign up to view the projects, just click on the link, and you'll be directed to the Sourceforge sign-up.) For more information, search for [HTML][PDF][Linux][PDF2Text](Sourceforge.
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