Crop PDF

What cropping a PDF does — and what it doesn't

Cropping changes the visible page boundary, not the page's contents. In PDF terms it adjusts the CropBox — the rectangle a viewer and printer use to decide how much of the page to show. Everything outside the new boundary is hidden from view and excluded from print, which is exactly what you want for trimming the black scanner border off a photographed document or shaving uneven white margins so a stack of pages prints consistently.

Because crop only moves a boundary, it is non-destructive in a way that surprises people: the content you cropped away still exists in the file. A reader that ignores the CropBox, or anyone who resets it, can bring the trimmed area back. So crop is the right tool for tidying margins and framing, but it is not a way to delete content you don't want others to see.

Crop is not delete

This distinction matters for anything sensitive. If a page has a header, a margin note, or a strip of another document's text in the gutter and you crop it off, the text is hidden but still embedded — recoverable by resetting the crop or extracting the raw text. To genuinely remove content you must delete it, not hide it. For pages you want gone entirely, use Organize PDF to drop them, and for cleaning a file before sharing, follow the privacy-cleaning guide.

Print bleed and consistent margins

• Scanned borders — phone scans and flatbed scans often add a black or grey frame. Cropping to the paper edge removes it and makes the document look like a clean original.
• Consistent margins — if pages were assembled from different sources, their margins won't match. A uniform crop gives the whole document a single, even margin so it prints and reads as one piece.
• Print bleed — commercial printing extends artwork past the trim line (typically 3 mm) so no white slivers appear after cutting. If you crop tight to the artwork, you remove that bleed and risk thin white edges on the printed result; leave the bleed if the file is going to a print shop.
• Whole-document vs per-page — a single crop applied to every page only looks right if pages share a size and orientation. Mixed layouts may need different crops, or none.
• If you need the file physically smaller in bytes rather than a different visible boundary, that's Compress PDF, not crop.