Adobe Acrobat is a family of application software and Web services developed by Adobe Systems to view, create, manipulate, print and manage files in Portable Document Format (PDF). The family comprises Acrobat Reader, Acrobat, and Acrobat.com. The basic Acrobat Reader, available for several desktop and mobile platforms, is freeware; it supports viewing, printing and annotating of PDF files. Additional, “Premium”, services are available for the reader on paid subscription. The commercial proprietary Acrobat, available for Microsoft Windows and macOS only, can also create, edit, convert, digitally sign, encrypt, export and publish PDF files. Acrobat.com complements the family with a variety of enterprise content management and file hosting services. You have to compress a PDF, be it to fit an arbitrary file size requirement, optimize for quick viewing, or save on data costs. There are several ways to go about doing so, depending on your platform, privacy needs, and how much time you have. Adobe Acrobat Reader DC is a free PDF reader, but the PDF optimization feature is available only as part of the paid Acrobat Pro subscription.
How to Compress PDF Files and Reduce Size using Adobe Acrobat
Open the PDF file in Adobe Acrobat.
Click Tools > Optimise PDF.
From the toolbar that appears above the PDF, choose Reduce File Size.
To get more control, head into Advanced Optimisation. Then click Audit space usage to see what page elements are taking up how much space.