The qpdf program is used to convert one PDF file to another equiv‐
alent PDF file. It is capable of performing a variety of trans‐
formations such as linearization (also known as web optimization
or fast web viewing), encryption, and decryption of PDF files. It
also has many options for inspecting or checking PDF files, some
of which are useful primarily to PDF developers.
For a summary of qpdf's options, please run qpdf --help. A com‐
plete manual can be found in /usr/share/doc/qpdf/qpdf-manual.html