Make a PDF small enough for e-mail. Images are downsampled, unused data is removed and text stays sharp.
Share any size of PDF, video or Office file as a HelpRange link: it opens instantly in the browser, you get an alert when it is read and can revoke access later.
PDF size comes mostly from images. Compression reduces their resolution to what a screen or printer needs, re-encodes them and removes duplicate objects – without touching the text and vector graphics.
Image-heavy PDFs (scans, decks with photos) often shrink by 50–90%. Text-only PDFs are already small and change little.
Balanced (150 dpi) is right for most documents; Strong (96 dpi) for screen-only reading; Light (200 dpi) when you will print.
No – it is processed in memory and not stored.