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Crop PDF Pages

Trim uniform margins, or let the tool find the real content area on each page and cut the dead white space away.

Automatic mode finds the content box on each page independently, which fixes badly centred scans.

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Cropping is most often needed after a scan: the page was placed slightly off-centre on the glass, so a grey strip of scanner bed runs down one edge, and the printed content sits inside a wide white border. Cutting that away makes the document easier to read on a phone and smaller to print.

Two modes cover nearly every case. Uniform margins shaved off all four sides is right when you know the geometry. Automatic detection renders each page, finds the bounding box of everything that is not white, and crops to that box plus the padding you choose — each page gets its own crop, which handles badly centred scans.

How to crop pdf pages

  1. Add your PDFDrop the document whose margins you want to trim.
  2. Choose a modeSet uniform margins in millimetres, or switch on automatic detection to let each page find its own content box.
  3. Adjust paddingAutomatic mode keeps a safety padding around the detected content so nothing important is clipped.
  4. Crop and downloadThe crop box is written locally; the page is not re-rendered, so the remaining content stays pixel-identical.

Frequently asked questions

Does cropping delete the content outside the box?
The crop box defines the visible area. Content outside it is hidden rather than destroyed, which is the standard PDF behaviour. Most viewers and printers respect it exactly as you would expect.
How does automatic detection decide what to crop?
Each page is rendered at low resolution and scanned for the outermost non-white pixels. That bounding box, plus your padding, becomes the new crop box for that page.
Will it work on a dark or coloured background?
Automatic detection assumes a light page. On dark backgrounds it will treat the background as content and leave the page mostly untouched — use uniform margins instead.
Does cropping change the file size?
Hardly at all. The page objects are only re-described, not re-encoded, so the file stays essentially the same size while looking much tighter.
Can I crop only some pages?
Yes. Uniform margins can be applied to a page range, and automatic detection processes every page individually.

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