What unit are the crop margins in?

Margins are entered in PDF points (pt). One point equals approximately 0.35 mm or 1/72 of an inch. A typical page margin is around 36–72 points.

Will cropping remove content from the PDF?

Cropping adjusts the visible area by setting the crop box. The original content is not deleted — it is hidden outside the crop boundary.

Yes. The crop margins you set are applied uniformly to every page in the PDF.

修剪页边距，去除不需要的空白。

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Set top, right, bottom, and left margins (in points) to crop. The crop is applied to every page of the PDF.

Cropping doesn't delete content — it just changes the visible area. Anything outside the crop box is hidden but still in the file.