How to reduce the PDF page size:
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Open your original PDF file in Adobe Acrobat Professional 6.0 or above.
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Choose File > Print.
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Choose Adobe PDF in the Printer Name box:
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Click on Advanced:
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Click on Advanced and then select 300 dpi, and then click on OK
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Click on OK again: (Click off “Auto-Rotate and Center” to
keep the same layout.)
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Save the resized PDF file: