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Read guide →Crop PDF
Trim PDF margins by setting a new crop box in points, which changes the visible area without discarding page content.
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Reviewed 2026-08-15
Free Crop PDF – how it works
Cropping sets each selected page's crop box, the rectangle a viewer uses to decide what part of the page to display. Margins are given in points, the PDF unit where 72 points make one inch, so 36 means half an inch off that edge.
Content outside the new box is hidden rather than deleted. That makes cropping reversible and completely lossless, since no text or image data is touched. It also means cropping is not a way to remove sensitive material from a page: the content is still in the file and a viewer that ignores the crop box will show it. Use Redact PDF when the goal is removal.
Crop margins are validated per page. If the values you enter would leave a page with zero or negative width or height, the operation stops and names the page rather than writing a broken document.
How to use Crop PDF online
- Add the PDF. Drop in the document you want to trim. Scans and print-oriented exports usually have the most wasted margin.
- Enter margins in points. Set top, right, bottom, and left. Remember 72 points to the inch, so 72 removes a full inch. Add a page selection if only some pages need it.
- Crop and review. Download the result and check that nothing you needed has moved out of view. If it has, crop the original again with smaller values rather than re-cropping the output.
When to use it
- Remove wide print margins so a document fills more of a tablet screen.
- Trim scanner edge artefacts and black borders from a scanned book.
- Crop a slide deck exported with surrounding whitespace.
- Cut header and footer bands off pages before combining them into a handout.
Known limitations
- Cropped content is hidden, not deleted. The file size stays roughly the same and the hidden material is still recoverable.
- The same margins apply to every page in the selection, so a document with inconsistent layouts may need more than one pass.
- Margins that exceed the page dimensions are rejected with an error naming the page, rather than producing an empty page.
Frequently asked questions
Is cropping a PDF reversible?
Yes. Cropping only sets the crop box, so the hidden content is still in the file and the box can be widened again later. Nothing is discarded.
Can I use cropping to hide confidential information?
No, and this is an important distinction. Cropped content remains in the document and can be recovered by widening the crop box or by any parser that reads the raw page. Redact PDF removes the pixels properly.
Is my PDF uploaded anywhere?
No. The document is processed by WebAssembly and JavaScript running inside the page, so the bytes never leave your device. There is no upload step and nothing to delete afterwards.
What unit are the margins in?
Points, the PDF native unit, at 72 to the inch. So 36 points is half an inch, 72 is one inch, and about 28 points is one centimetre.
Does cropping change the file size?
Barely. Because content is hidden rather than removed, the saved file is close to the size of the original.
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