The best Java PDF SDK to Modify Calculated Field PDF

In grad school, much of my reading comes from pdf files my professors post. Prior to PDFfiller, I would print out hundreds of papers in order to annotate. Now, I can annotate while conserving resources and I have access to the files no matter where or what device I use.

I really have needed a tool like this to turn a number of internal business documents into fillable forms. Do not want to have to buy a typewriter to do the tasks PDF filler can do so easily. Without any training I have been able to do the basic functions just fine. I would be interested in furthering my skills be learning how to do more sophisticated editing or creation.

What do you like best?
The ability to create a document, upload a document, search and find document files, edit, and then fax or email to anyone anywhere right from the convenience of your laptop anywhere in the world. All documents created are saved in your account for return access, and activities (fax, email and receipts for delivery) are also recorded and saved.
What do you dislike?
So far I have not discovered something I do not like. I have uploaded, created, searched for online documents to use, and both faxed and e-mailed documents without an issue.
What problems are you solving with the product? What benefits have you realized?
Can work and send from home, work, on the road. No need to hunt for a fax service / company; no need to leave where I am at to go fax a document; can work and send documents in the middle of the night right from home or while on the road; have been able to search and find online documents and upload into account for editing use; easy to share documents via PDFiller; you can send documents to anyone with an e-mail address - your recipient does not need to leave their laptop either!