The Compress option will go over the document and lower the file size by reducing the overall aesthetic quality.
The option Compress can be found in the File Menu.
Now choose the Compress option. You will now decide how much to reduce the quality by sliding the marker along the line. Read the description next to each quality level in order to optimize your file size to best suit your needs. When you are ready, select Compress. A new PDF will be created with a reduced file size.
PDF Architect will now display a window advising the estimated size of your file after the size is reduced. Click on Save.
A new PDF will be created with a reduced file size.