PDF file size reduction can be done in a number of ways. You can reduce PDF size in Acrobat and other downloadable PDF editors, you can use function-specific tools like PDF compressors, or you can reduce PDF file size online with a web-based application. Using Acrobat to reduce file size is relatively straightforward, but if you're looking for how to reduce PDF file size in Adobe Reader DC - or even an unregistered version of Adobe Acrobat DC or Pro DC - then you're out of luck. Let's first look at how to reduce PDF size in Acrobat during the free trial period or with a registered product. After that, we'll take a quick tour of PDFelement, a totally free solution to minimize and optimize PDFs.