PDFsam Basic allows you to enable PDF compression to compress the generated PDF files

Enable PDF compression

Enabling PDF compression tells PDFsam Basic to generate output files using a PDF feature called Objects Streams where most of the PDF objects are stored in a compressed stream, usually resulting in a PDF with a smaller size.
Some of the PDFsam Basic modules like the PDF extract and the various PDF split, in some cases perform an optimization where unused resources (fonts, images) are removed from the generated PDF files.