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> I have a PDf document on A4 format and want to reduce it to A5 (but without > reducing the font size) to be able to read it on my ebook reader.
> So I want less characters on a page, so in stead of 60 rows with 80 chars, I > want 30 rows with 40 chars.
> I installed PDFill (free ware) but it's not clear how to accomplish what I > want (maybe it's not the right tool ...)
You can't reformat PDFs that way: it was expressly designed NOT to do that -- it's basically a fixed, end-of-line format. If you have the original source document, reflow it and regenerate the PDF. There *is* a limited amount of reformatting available if the PDF has been created to permit it (called reflowing) but it's rare.
What I do with some PDF books is use LaTeX and pdfpages to resize the pages, trimming off all marginal white-space (leaving about 6pt) and making the document landscape orientation. That way the pages fit nicely on my Nokia N800 held vertically like a bookreader, and I can flip from page to page with my thumb. But it can't and won't change the line-layout.