Pdfmod is very simple and powerful tool to add (as bookmarks) an outline (structure) to a pdf.
automatic crop pdf margins
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”.
save only some pdf pages from a 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).
re-ocr a pdf with Adobe
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.
manage pdf online
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).
convert big (text) pdf files to word
This website has converted a big (5mb) text pdf file to word in a very good way.
convertire un documento in html/epub
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.
OpenOffice: crash on pdf export
Può succedere (fa arrabbiare non saper spiegare esattamente perché, ma è così).
Due le soluzioni, in Linux:
- loggarsi come root e allora export as PDF funziona senza problemi
- usare il comando print -> to file
Si tratta di ripieghi, daccordo, ma almeno provvisoriamente servono 😉