Does cropping remove the hidden content from the file?

No, and this is the one thing worth understanding before you rely on it. A PDF crop sets the box a reader displays; everything outside it stays in the document and comes straight back if the box is widened again. We tested exactly that — cropped content reappears intact once the box is restored. If you are cropping to hide something private, remove those pages instead, or cover the area and flatten the result.

Can I crop every page at once?

Yes, and that is the default. The rectangle is stored as a proportion of the page rather than a fixed number of points, so it means the same thing on every page even when their sizes differ. You can also limit it to a range if only some pages need trimming.

Will cropping make the file smaller?

Hardly at all, for the same reason the hidden content is recoverable — nothing is thrown away. Cropping changes what is shown, not what is stored. If size is what you are after, compressing the file will do far more.

Is my file uploaded anywhere?

No. The PDF is opened and rewritten by your own browser, and the page ships a Content Security Policy that blocks connections to any other origin. You can turn off your network connection and the tool still works.

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Crop a PDFto the part that matters

Trim the margins or the scanner shadow. Your file never leaves this device.

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Every page is shown, so you can see what the crop does across the whole document. It is opened on this device and never uploaded.

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What cropping a PDF really does

Cropping a PDF is not the same as cropping a photograph, and the difference matters. It sets the area a reader displays, leaving everything outside it in the file — hidden rather than removed, and recoverable by anyone who widens the box again. That is worth knowing before you crop a bank statement to hide an account number. For what cropping is actually good at — scanner shadows, oversized margins, a slide deck exported with white borders — drag a rectangle over the page and the rest is trimmed away on every page you choose.

The area is chosen as a proportion of the page, so a document mixing portrait and landscape pages crops sensibly rather than fitting the first page and spilling off the rest.
Cropping is relative to what is currently visible, so a document that has been cropped before crops again within what is left.
Pages stored sideways are handled properly — the rectangle you draw is the area you get, whichever way the page is stored.
Everything runs on your device. The page ships a Content Security Policy that blocks connections to any other origin, so a document you crop here cannot be sent anywhere.

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