Does cropping discard the trimmed content?

No — cropping in PDF is a viewport change. The underlying content is preserved; viewers just clip to the new media box.

What units does the crop use?

Points (1 pt = 1/72 inch). An A4 page is 595×842 pt. Most viewers display in points natively.

No. pdf-lib runs locally in your browser. The file is processed in memory and never reaches a server.

Crop PDF

Trim uniform margins off every page or resize to a specific media box. Useful for removing scanner borders, killing oversized headers, or tightening pages for e-readers. Runs entirely in your browser.

100% client-side · pdf-lib · no upload

PDF file

Drop a PDF to read page dimensions.

Top (pt) Right (pt) Bottom (pt) Left (pt)

How to crop a PDF

Drop your PDF onto the picker.
Set the margin (in points) to trim from each side.
Press Crop PDF and download the result.

1 inch = 72 pt · 1 cm ≈ 28.35 pt. A4 = 595×842 pt; US Letter = 612×792 pt.

Common use cases

Scanner borders: chop the 10–20 mm of white space around scanned pages.
Header/footer removal: trim oversized title bars or page numbers.
E-reader formatting: shrink margins so reading apps render text larger.

Frequently asked questions

Is content actually deleted?

No — cropping changes the visible viewport (media box and crop box). The underlying content streams are unchanged.

Can I crop only some pages?

This tool crops uniformly across every page. For per-page cropping, split the PDF first, crop each, then merge.

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