Terrific app
After struggling with Adobe Acrobat, which achieved only modest compression and messed up my photos, I turned to PDF Toolkit+, ridiculously priced at $2. It reduced a PDF of 500 photos from 1.4GB to 185MB, small enough to upload to CreateSpace, while still keeping the photos at 300dpi. Very easy to concatenate the front and back matter, too. Someone here said it was the best $2 he or she spent on an app, and I’d agree with that.
Fargo North Decoder about PDF Toolkit +