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I had my documentclass set at 10pt and I import my TikZ figures just with \input. Everything was working fine but now I want to have 11pt in the document and all my nodes are bigger because the fonts are now bigger and everything is distorted.
So, how can I set the fontclass (or whatever name it has) in TikZ to 10pt so the normalfont in the figures is 10pt as I had designed everything with in mind instead of 11pt that would be the actual document?
If you do not change the font size within your pictures, it is fairly simple and you could just try this:
\documentclass[11pt]{article}
\usepackage{tikz}
\tikzset{
font={\fontsize{10pt}{12}\selectfont}}
\begin{document}
This is some text.
\begin{tikzpicture}
\node {This is a node.};
\end{tikzpicture}
This is some text.
\end{document}
Obviously, if you use commands like \small etc. within pictures, things are more complicated.
10pt or if I decide on 12pt.) Since the diagram requires a specific size, it makes more sense to use an absolute specification than one dependent on the document default setting. That is, the advantage of \small is that it will automatically adjust if you change the global size. But that is precisely what is not wanted in this case.
\small to get the respective 10pt \small variant in the picture. How can I get that?
\small in every tikzpicture, but why not just use a different command in these cases?
\let\standardsmall\small\let\small\newsizemacro at the start of the environment, where the font is set to 10pt. But I'd only do this if, like the OP, your code is already written and you need a 'quick fix'. Otherwise, better to use the \newsizemacro directly.