a thoughtful use of digital
A good website is Convertio: it can convert, for free, your pdf to an svg absolutely identical, from a graphical point of view, with your original pdf, and the text remain text.
But on the other hand the resulting svg file is much bigger than the original pdf, because it is not optimized at all.
Pdfmod is very simple and powerful tool to add (as bookmarks) an outline (structure) to a pdf.
I found this excellent tool: PdfCropMargins, a very light app (both for Linux and Windows), which can crop automatically pdf white margins (top,bottom,left,right) even if they are very irregular (different from page to page). With a great accuracy. And without growing the pdf size.
You can use the gui, starting from a command line, such as pdf-crop-margins -gui “original-pdf.pdf” -o “target-pdf.pdf”.
You can use Okular, of course: print to file -> the pages you want. But thus you get an image pdf. If you want keep a text pdf, you can use a program like PdfArranger, which allows to save (only) the pages you want from a whole pdf, keeping them as searchable pdf (text).
You have to 1) save the old searchable pdf to tiff images (as many as the pages), 2) ocr the tiff images to a searchable pf 3) combine the new multiple pdf to one pdf.
Excellent websites are https://www.sejda.com/ (with the only limit of three works per hour, regardless to the pdf pages number) and https://tools.pdf24.org/ (with no limitations, but with less features than the first one).
This website has converted a big (5mb) text pdf file to word in a very good way.
E’ meglio non farlo direttamente da LibreOffice, ma con FF Multiconverter, che usa i tag i e b, e non span. Il che permette di ripulire bene, successivamente, il codice sorgente.
Può succedere (fa arrabbiare non saper spiegare esattamente perché, ma è così).
Due le soluzioni, in Linux:
Si tratta di ripieghi, daccordo, ma almeno provvisoriamente servono 😉