Exporting Files as PDFs without Exponentially Increasing File Size

[GregV]

I completed my Affinity Publisher book and it is approximately 32 MB. I should have read the software's limitations sooner, but I now realize that the only outputs are either printing the document or exporting it as a PDF, no e-book per se. When I export to a PDF for use an an iPad or other device, the PDF size is approximately 320 MB. I was surprised by the dramatic ten-fold increase in size.

Is there a way to export the file so that it maintains what I would consider a reasonable file size so it can be saved an a tablet and not use up so much storage?

[Fixx]

Check the images.

Are they 16-bit or 8-bit? CMYK or RGB? 8-bit RGB it should be. 

Check resolution. Consider if it is unnecessarily high and use downsample feature in export window to take it down.

Add compression. If all above things are taken care of it is the only tool that can affect filesize (unless you use some more effective compression app for PDF compression - may be too exotic..)

[GregV]

Mr. Fixx:

Thank you. Changing the dpi reduced the PDF file size to about 75 MB, and the quality of the PDF still looks fine to me. I appreciate your reply.

[Fixx]

You are welcome. Try not to take dpi too low, using higher compression should be the main tool for optimization.