Scanned pages arrive with dark edges and lopsided borders. Academic papers ship with margins designed for binding nobody will do. On a tablet or phone, those margins are wasted pixels that force zooming and side-scrolling.
Cropping locally
The Crop PDF tool trims a set amount from each side of every page — enter the top, bottom, left, and right trim in points, preview the result, and download. Processing stays on your device.
Where cropping pays off
E-reader and tablet reading: trimming an inch of margin makes body text meaningfully larger without zooming. Slide embedding: a cropped page drops into a presentation without a white halo — or go further and convert the page to PNG. Scanner cleanup: the black strip along a crooked scan’s edge disappears with a small trim. Print consistency: before merging documents from different sources, cropping to a common content width makes the assembly look intentional.
Measure once
PDF points run 72 per inch — a half-inch trim is 36 points. Crop conservatively on the first pass and check the preview; page numbers and footers live closer to the edge than you remember, and a crop that beheads them means starting over. If the real problem is orientation rather than margins, you want rotation instead.