Why is the PDF bigger than my HEIC photos?
HEIC stores photos more compactly than JPG, but a PDF cannot hold HEIC images. Every photo is therefore re-encoded as a JPEG on its way into the PDF — at full size and 92% quality with Original — so the PDF usually ends up larger than the .heic files you started with.
When size matters, choose Smaller file under Quality. The longer side drops to 2,480 pixels and quality to 75%, which brings a phone photo down a long way while staying sharp on a printed A4 page.
















