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How can I change the default font size throughout the LaTeX document? Is this even possible?

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There are two general answers below if you need a more detailed answer improve your question please, and tell us at least which class you are using … – Tobi Feb 7 '12 at 18:05
up vote 15 down vote accepted

at least some document classes provide an optional argument to do this. for example,


will provide a changed set of font sizes (\footnotesize will be smaller, for example) in a coherent style.

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The memoir document class provides an extended range of font sizes (9 to 13 points). – Michael Palmer Feb 7 '12 at 21:18

The standard classes have options 10pt, 11pt and 12pt to load configurations for a main font in the given size and matching sizes for headlines etc.

If your using KOMA-Script use the option fontsize=<size> to set a size that may differ from the above three.

To change the size of the main font only try \fontsize{<size>}{<skip>}\selectfont but this is not a real user command so one should know what he does when using it ;-)

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It's worth noting that the extsizes classes (extarticle, extreport, etc.) support font sizes from 8pt to 20pt. – Ian Thompson Apr 7 '14 at 9:39

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