DigiSigner

With DigiSigner installed on your PC you will be able to sign PDF files, insert text in PDF files, and insert images in PDF files. As the tutorial states, using DigiSigner to sign your PDF will take no more than 5 minutes. It won’t take long because you can very easily access the application's functionality from its user friendly interface.

DigiSigner is available as an installer for Windows, an archive for Mac OS X, a ZIP archive for other systems, an applet component, and a Java library.
The DigiSigner installer for Windows is close to 9MB in size. A setup wizard will show up when you run it and will guide you through the installation process. You’ll see that installing DigiSigner will not take long.

The main panel of the application’s interface displays the PDF file you want to sign (when you first launch the application, it will display a tutorial file that provides useful information on how to sign a PDF).
Above this main panel there’s a File Menu and a toolbar with buttons for multiple functions: open PDF, print PDF, sign document, zoom in/out, and more.

Using DigiSigner to sign a PDF document is a very simple 3-step process:
Step 1 – load a PDF file.
Step 2 – click Sign Document and select the region where you want to apply the signature.
Step 3 – from the digital signature dialog select an existing signature or create a new one; then apply it to the PDF file you loaded.

To better put things in perspective, here’s a quick look at the features that DigiSigner puts at your disposal: sign PDF files, create your own certificate, batch sign documents, insert text, insert image, validate signatures, view document info and document permissions, print out documents, attach documents to emails, rotate documents, sign documents invisibly, search documents.

DigiSigner is a free application.

Thanks to DigiSigner, in just a few clicks you can sign PDF documents.