If you need to process your PDFs then there’s no shortage of free options. JPDF Tweak alone can crop or rotate pages, apply text and image watermarks, encrypt, decrypt them, and so on. You’ve probably come across similar toolkits yourself.
Even the best of these programs will have some gaps in its functionality, though: some security options missing, limited batch processing, inflexible split or merge tools, maybe can’t create linearized (web-friendly) PDFs. And so sometimes, just occasionally, you’ll need a heavy-duty solution like the command line QPDF.
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