JSignPdf is a free, open source application that adds digital signatures to PDF documents. It supports visible and hidden signatures, certificate levels, timestamping, and batch processing from the command line.
Features:
Version 3.2.1
A bug-fix release for the JavaFX GUI, with two fixes contributed by the community. Thanks to Ladislav Nemec and Milos Jakubicek.
document_EM.pdf became document_EM_DL.pdf instead of document_DL.pdf). A derived output name is now recomputed with the new suffix, a name you typed yourself is kept, and a new session no longer starts with the output file name left over from the last run. See pull request 505.Ctrl+Q) now saves the signing options, as closing the window already did.