pdftk is a command-line tool for working with PDF files. It is commonly used for client-side scripting or server-side processing of PDF files.
This snap is an unmodified Ubuntu 16.04 binary package that is re-packaged as a snap.
More info at https://www.pdflabs.com/tools/pdftk-server/ .
If you have issues with the snap, please feel free to file them at https://github.com/smoser/pdftk/issues