title: LaTeX - Changing the font size for a document, but in the preamble, not the document class?
body: <p>I have a LaTeX document. I want to change the font size of all the text, to make it smaller.</p>
  
  <p>Normally I would just change the <code>documentclass</code> 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.</p>
  
  <p>Is there anyway to change the font size in the preamble, without touching the documentclass declaration.</p>