latex noindent for whole document

Sure! Here is an example of how you can use the \noindent command in LaTeX to remove the indentation for the whole document:

\documentclass{article}

\begin{document}
\noindent

This is the first paragraph.

This is the second paragraph.

This is the third paragraph.

\end{document}

By using the \noindent command at the beginning of the document, you can remove the indentation for all paragraphs in the document.