Reduce the weight of a PDF before uploading it
The maximum PDF size for this upload is 50 MB.
File size and page count are separate limits. Without an account or with a free account, each PDF is limited to 100 pages. See the pricing page for the limits of other plans.
For reading on screen, try exporting at 150 ppi, then zoom in to check small text and images. Keep the original PDF for printing.
File → Export → Adobe PDF (interactive or print), then Compression: bicubic at 150 dpi, average JPEG quality.
File → Save as another format → Optimized PDF. Set color images to 150 dpi.
gs -sDEVICE=pdfwrite -dPDFSETTINGS=/ebook -o small.pdf big.pdf
Split the document according to your plan limits and the sections useful to your readers. Each volume must meet both the file size and page count limits; compressing images does not reduce the number of pages.