How to Crop a PDF to Remove Margins and Scanner Borders
A scanned book arrives with thick black borders around every page. A report has margins so wide that the text is tiny on a phone. A slide export carries a footer you do not want on screen. Cropping cuts the page down to the part you want, so it fills the screen and prints without the clutter.
Crop every page at once
Open Crop PDF and add your file from your device, Google Drive, Dropbox or OneDrive. The first page appears with a crop box. Drag the edges and corners to frame what you want to keep, or start from a preset: Full page, 1:1, 4:3, 3:4 or 16:9. Press the crop button and the same area is applied to every page. Download the cropped PDF and check a few pages.
Because one box is used for the whole document, frame the first page with a little room to spare if other pages have slightly different layouts, so no line of text near the edge is cut off.
Straighten before you crop
On pages scanned at an angle, a tight crop cuts off the corners of the text. Straighten them first with Deskew PDF, then crop.
Cropping is not redacting
In most PDFs, cropping hides the area outside the box rather than deleting it: the content can still be in the file and may reappear in another program. Never crop to remove private information such as an address or account number. Use Redact PDF, which removes what is under each black box from the file.
Crop or change the page size?
Cropping removes part of the page. If you need every page to be A4 or Letter for printing, with all the content kept, use Change PDF Page Size, which scales the content to fit the new size instead. For a single picture rather than a PDF, Crop Image does the same job for JPG and PNG files.