QPDF is described as 'It could have been called something like pdf-to-pdf. It also provides many useful capabilities to developers of PDF-producing software or for people who just want to look at the innards of a PDF file to learn more about how they work' and is an app in the os & utilities category. There are more than 10 alternatives to QPDF for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is PDFsam, which is both free and Open Source. Other great apps like QPDF are PDFtk, PDFEncrypt, Stellar Repair for PDF and iSafePDF.
QPDF is mainly a PDF Editor but alternatives to it may also be Document Managers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of QPDF.
PDFEncrypt is a free, open-source utility for Windows that encrypts any PDF file using industry-standard encryption algorithms. Simply select the unencrypted file, enter a password, and the encrypted file is generated.
Stellar Repair for PDF It is an effective Windows-based PDF repair software that can repair damaged PDF files. It restores forms, headers, footers, word art, clip art, page format, shapes, charts, and tables enclosed in the PDF files.
For 9.99 $ A-PDF Restrictions Remover is extremely easy to use. Just right click the PDF file in Windows Explorer, and in the context-sensitive menu that pops up, select either the "Remove Restrictions" or "Remove Restrictions & Save as..." option.