QPDF

Problem I have unprotected input1.pdf input2.pdf and I want to create one single encrypted.pdf. My try I looked up QPDF’s manual and tried the following command. qpdf --empty --pages input{1,2}.pdf --encrypt upw opw 256 -- encrypted.pdf but I got this error. qpdf: unrecognized argument --encrypt (pages options must be terminated with --) For help: qpdf --help=usage usage information qpdf --help=topic help on a topic qpdf --help=--option help on an option qpdf --help general help and a topic list Solution The sentence inside the parentheses says it all. [Read More]

Background On M$ Win*, I don’t have dedicated PDF readers like Adobe. During visioconference, one might want to share some downloaded PDFs. Those documents can be part of an ebook or notes. In some situations, they can provide context to a discussion. Problem Under the same folder, you might have downloaded_ebook.pdf personal_info.pdf other_personal_stuff.pdf that you don’t want to expose while streaming. However, each downloaded PDF usually comes with a name set by others. [Read More]

pdfunite is fairly easy to use.

pdfunite PDF-sourcefile1..PDF-sourcefilen PDF-destfile

Another way is to use QPDF. I’ve learnt to add --empty from @qpdf/qpdf:#12.

qpdf --empty --pages *.pdf -- out.pdf