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Scanned pages come with a wide white border, slides export with a black frame, and a page cropped for the screen is easier to read on a phone. Type the margins in millimetres or per cent, press Auto-trim to have the page content measured for you, and watch the preview: the shaded band is what goes, the outlined rectangle is what stays.
The crop is written into the page box itself — both the CropBox and the MediaBox — so PDF viewers, browsers and printers show the trimmed page. Nothing is re-rendered: the text stays selectable and searchable, vector graphics stay sharp, and the file stays about the same size.
Crop every page with the same margins, or select only the pages that need it from the thumbnails. Auto-trim measures whichever pages you chose and keeps the widest content of any of them, so nothing is cut off a page that has more on it than the others.
Not for: Removing content for good — a crop hides the margins, it does not delete what is under them; flatten to images if that matters.
Millimetres cut the same strip from every page, whatever its size. Per cent cuts a share of each page's own size: left and right are a share of the width, top and bottom a share of the height. In a document whose pages differ in size, per cent removes a border in proportion to each page, while millimetres remove exactly the same amount everywhere. The quick buttons set 5, 10 or 20 mm on all four sides at once. The boxes accept digits of any script, and a comma works as the decimal mark.
Top, right, bottom and left always mean the page as you see it. If a page is stored sideways and shown upright through a rotation setting, the margins are converted for you, so a value typed for the top cuts the top of what you read.
Auto-trim treats any pixel that is not close to white as content, so it can only remove white or nearly white borders. A black frame around exported slides, a coloured or grey page background, or the dark shadow a scanner leaves along an edge all count as content, and the margin on that side stays at or near zero. Type that side yourself and use the preview to see where the frame ends.
Each page is measured from a rendering about 400 pixels wide, roughly half a millimetre per pixel on an A4 page, and the result is rounded to a tenth of a millimetre. Measuring every page of a long document takes a while; the progress line shows which page it has reached. Blank pages are skipped, so an empty divider page does not prevent the others from being trimmed.
The Crop button stays off while the margins cover almost the whole preview page. If a smaller page elsewhere in the document would be left less than about 3 mm wide or high, the tool stops and names that page. Besides the page box, cropping removes any trim, bleed and art boxes the file had. These are the marks a print shop uses, so a file prepared for professional printing loses that information. The result is named after the original with "-cropped" added.
A cropped page keeps its new, smaller size. If it has to go back onto A4 or Letter, /change-pdf-page-size with Scale to fit enlarges what remains so it fills the sheet, which is a simple way to make text with wide margins print larger.
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