Shrinks a PDF's file size by compressing embedded images and optimizing the document's internal structure — useful when a file doesn't fit an attachment limit or takes forever to load.
For example: A PDF presentation with photos weighs 40 MB but your email caps attachments at 25 MB — compress it and it will fit the limit without hurting text readability.
Who uses it most: Office workers, teachers, document management specialists
No — compression mainly targets embedded images; text stays crisp and selectable, just like the original.
It depends on the content: a PDF full of photos can shrink 50-80%, while a text-only document without images will shrink noticeably less.