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How should I change font size for the entire document? I want to design a presentation and fonts should be larger, all of them.

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Uh, use the fontsize argument to the documentclass? – Harald Hanche-Olsen Dec 20 '10 at 12:45
12pt is the maximum, as far as I know. I need bigger fonts, 16pt actually. – yegor256 Dec 20 '10 at 12:51
Have a look here. Is your question answered there? – Hendrik Vogt Dec 20 '10 at 13:03

Not really an answer to your question. But there are special classes for presentations (which is what you want to do) that change fonts etc.

The most famous is probably beamer but there are also some specifically for transparencies if you want that. Have a look at the catalogue.

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Just FYI, the way beamer handles the problem is to make the document itself very small, so 12pt fonts look very big in full-screen mode. It works quite well, though. – frabjous Dec 20 '10 at 14:16
Yes, you are absolutely right. It does change the default to sans serif though ;-) – Carsten Thiel Dec 20 '10 at 14:19

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