Reorder and 2-up your PDF so duplex-printed sheets fold into a saddle-stitch booklet.
Print the output double-sided (duplex) and choose “flip on short edge”. Then fold the whole stack in half — the pages fall into reading order. Staple along the fold for a saddle-stitch finish.
A folded booklet always holds a multiple of 4 pages, so we pad the end with blanks. Add your own blank pages first if you’d rather control where they land.
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Place 2, 4 or 9 pages on each A4 sheet — sharp vector copies, great for printing handouts.
Insert blank pages anywhere in a PDF — sized to match their neighbours.
Rearrange pages visually with live thumbnails, then rebuild the document.
Flip a PDF so the last page comes first — fixes documents scanned back-to-front.