How do I decrease page margins without being clipped to the right and the bottom?

Question

To decrease page margins, I tried increasing these values:

\textwidth=7in \textheight=8in

However, the text got wider and taller but the left and top margins did not decrease.

I then tried setting some other values to 0 too.

\topmargin = 0in \oddsidemargin = 0in \evensidemargin = 0in

However, the left and top margins still exist. How do I decrease the left and top page margins?

Answer 1

use

\usepackage[a4paper,left=0in,right=0in,top=0in,bottom=0in]{geometry}

in the preamble.