How to reduce the size of a pdf-file?

I had many pdf-pages in picture configuration, so they were too big! Thus, I would like to change them to text configuration for minimum size. How can I reduce the documents?
How to reduce the size of a pdf-file?
If you're using Acrobat, specifically, there's an option somewhere to reduce the file size. Click on help in Acrobat to find it.
How to reduce the size of a pdf-file?
U must have Adobe Professional to do it. The link below shows you the detail step how to do it.

http://www.planetpdf.com/creative/articl鈥?/a>

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