How to create a 300 dpi pdf file?

I have to send a 300 dpi PDF file, and I'm using Adobe Reader XI. But I can't find a way to raise the resolution or the files I create. What can I do?

Welcome to a surprisingly complicated world.
Adobe Reader is not an editor. Adobe Acrobat is an editor.
PDF files do not have a simple resolution. Rather, they are a mixture of text, line art and shapes - neither of which have resolution - and images. Images each have a separate resolution.
Acrobat Pro has a preflight tool. It can check things like "are there any images less than 300 dpi".
No responsible tool would ever INCREASE the resolution of files you create. This would vary between pointless and dangerous; it could have a catastrophic effect on work you pay a lot of money to print. You must start with higher quality originals, if you have a low resolution PDF it is too late to fix it - like trying to turn chicken soup back into chicken.

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    À: René Allamelle
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