What are two options that can reduce the size of attached PDF files?

Reducing the information included and limiting images is an effective way to decrease the size of attached PDF files. This approach focuses on the content of the PDF; by eliminating unnecessary text or data and minimizing the use of high-resolution images, you inherently reduce the file size. Each compressible element in a PDF contributes to the overall size, and by streamlining content, the resulting document is more efficient and easier to share or store.

While compressing a PDF file and encrypting it might lower the size to some extent, encryption does not inherently reduce file size; it may even increase it slightly due to added data for encryption processes. Removing all graphical elements and using only text would lead to a potentially bare-bones document, but it may not be necessary or appropriate for all purposes, and it doesn't allow for flexibility when high-quality visuals are required. Merging multiple PDFs into a single file could lead to an increase in size, depending on the content and number of files being combined, rather than a reduction.