How to Automatically Remove White Margins from a PDF on iPhone

TL;DR

PDFCrop detects and removes the white margins around a PDF page with one tap, showing a real-time preview so what you see is what you get — all processed locally, nothing uploaded.

Steps

Open your PDF in PDFCrop.
Tap auto-crop to detect and remove the white margins.
Check the real-time preview — what you see is what you get.
Fine-tune the crop by hand if a page needs it.
Export the tighter, cleaner PDF.

Why it works this way

Scanned pages and exported documents carry wide white borders that waste space and look unpolished. PDFCrop detects those margins automatically so a page tightens up in one tap, and the live preview means no guesswork about the result. It runs entirely on-device, so even confidential documents never leave your phone.

Tips & edge cases

Auto first, adjust second — let detection do the work, then nudge if needed.
Uneven scans may want a manual tweak on a page or two.
Local only — good for contracts and sensitive scans.

FAQ

Do I have to draw the crop area myself? No. PDFCrop detects the white margins automatically in one tap; you can fine-tune by hand if needed.

Can I see the result before committing? Yes. A real-time preview shows exactly what the crop will look like.

Is my document uploaded? No. Everything is processed locally on your device.