[Tex/LaTex] Reduce margins of a PDF with \includepdf

Question

I have a book in pdf and I need to reduce all the margins. This is my code:

\documentclass[a4paper, 14pt]{article}
\usepackage{pdfpages}
\begin{document}
\includepdf[pages={21-40},nup=1x1,
 offset= 0 0, 
 delta= 0 0,
 fitpaper=true,
 noautoscale=false]{book.pdf}
\end{document}

Any help? Many thanks!

Answer 1

you can use trim=Left Bottom Right Top, clip

\documentclass[a4paper, 14pt]{article}
\usepackage{pdfpages}
\begin{document}
\includepdf[pages={21-40},fitpaper=true,
            trim=35mm 10mm 15mm 15mm, clip]{book.pdf}
\end{document}