How to Manually Adjust the Crop Area of a PDF on iPhone

TL;DR

PDFCrop lets you drag any of the four corners to set the crop area precisely, with a real-time preview — so pages that auto-crop can't perfectly handle still come out exactly how you want.

Steps

Open the PDF in PDFCrop (auto-crop first if you like).
Drag the four corners to set the crop area.
Watch the real-time preview as you adjust.
Confirm the crop for the page.
Export, or apply to all pages if the layout is consistent.

Why it works this way

Automatic detection nails most pages, but skewed scans, figures that bleed to the edge, or intentional asymmetry need a human hand. Four-corner dragging gives you exact control, and the live preview removes the guesswork — you’re always looking at the finished result, not a rough box.

Tips & edge cases

Start from auto-crop and refine, rather than drawing from scratch.
Watch the preview to avoid clipping content near the edge.
Consistent layout? Apply your manual crop to all pages at once (Pro).

FAQ

How precise is the manual crop? You drag each of the four corners independently, so you can set the crop exactly where you want.

Can I preview as I drag? Yes. The real-time preview updates so you see precisely what you’ll keep.

Can I still auto-crop first? Yes. Auto-crop, then hand-adjust from there for the best of both.