Digital Signer (Digital Signature) is software that digitally signs PDF documents using PKCS #12, X.509 digital certificates, pfx file, USB token (digital signature), Hardware token, Smart Card. Designed and developed by Pulkitsoft. Its also called digital signature software. Using this product you can quickly sign single/multiple PDF files (batch mode) by selecting input and output directory/folder. This is ideal for bulk signing of a large number of corporate documents rather than signing each one individually.