DigiSigner Pro is a tool to view and digitally sign PDF documents, it can secure your PDFs. A tool for viewing and digitally signing PDF documents using X.509 certificates. It is implemented in Java and can run on MS Windows, Mac OS X, Linux or other platforms with Java support.

Create nice looking signatures with Portable DigiSigner Pro. Make your documents look professionally with Portable DigiSigner Pro. Show your customers and partners that you care about security.

Features:
1. It is a PDF viewer so you can always open and inspect the document you are going to sign. Using your mouse you can easily place the signature wherever you want in the document.
2. It produces Adobe Reader compliant digital signatures, which can be verified in Adobe Reader and vice versa.
3. You can create invisible and professionally looking visible signatures with DigiSigner Pro.
4. It lets you design your own signature appearances and you can create as many of them as you want.
5. You can sign your documents using smartcards, USB sticks, certificates from Windows key store or from files. All standard certificate key store types are supported.
6. Key stores can be easily added or removed and DigiSigner always memorizes all the changes you made.
7. It lets you define allowed and disallowed changes in the document.
8. It supports timestamped signatures.
9. It shows and verifies existing digital signature in the document. It is as easy as clicking on them.
10. It lets you quickly open PDF documents using right-click mouse menu (on Windows).
11. You can simultaneously open and sign as many PDFs as you want

Requirements:
* Java

Limitations:
* Watermark on the output file

The license of this software is Free Trial Software, the price is $29.95, you can free download and get a free trial.