LaTeX - Changing the font size for a document, but in the preamble, not the document class? [closed]

Question

I have a LaTeX document. I want to change the font size of all the text, to make it smaller.

Normally I would just change the documentclass part. However I am generating LaTeX files from another programme, and it is setting the documentclass, I can't change that. However I can put things in the preamble.

Is there anyway to change the font size in the preamble, without touching the documentclass declaration.

Answer 1

You can use the \fontsize{size}{skip} command, where size is your desired fontsize, and skip is the distance between lines (multiplied by baselineskip). For the new fontsize to take effect, you need to follow this command with \selectfont.

A similar question has been asked here: how to set LaTeX font size in millimeter?

Answer 2

See LaTeX - Changing the FontSize. You can surround your text in begin...end blocks for the specific size, or you can surround your text with braces where you place the size immediately after the brace. Example:

\begin{Large}
This text is large.
\end{Large}

Or, using the braces:

{\Large This text is large.}