Strong endorsement. I’m fine with pdftk except for rotating pages: it seems to be using annotations vs actually rotating the image in the pdf. I’m using some odd software that chooses to ignore these annotations and so even though I fixed the page orientation with pdftk in the source pdf, that software will still display it with the wrong orientation (and fail at ocr for that page)
I’m hoping pdfcpu does the right thing instead and actually rotates the image in the file.