What does this Crop PDF tool do?
It trims a chosen amount off the top, bottom, left and right of every page in a PDF. You set each margin in millimetres, watch a live preview shade the area that will be removed, and download a cropped copy. It's the quickest fix for oversized white borders, scanner edges, and pages that waste half the screen on margins when read on a tablet or e-reader.
How to crop a PDF
- Add your PDF — the first page appears as a preview.
- Enter trim values for top, bottom, left and right. The shaded regions on the preview update as you type, showing exactly what gets cut.
- Click apply to crop every page by those amounts, then download the result.
How PDF cropping works
Every PDF page can carry a crop box — an instruction to viewers and printers that says "only show this rectangle". This tool sets that crop box on each page, offset from the page's original edges by your margins. Because the underlying content is untouched, cropping is instant, lossless and reversible in principle. It also means cropping is not redaction: content outside the crop box is hidden, not deleted, and a determined person could restore it. To truly remove sensitive content, don't crop it — delete the page or redact it before sharing.
What people crop
Scanned books and papers with heavy black edges. Journal articles with huge academic margins, cropped tight for comfortable tablet reading. Sheet music trimmed to maximize note size. Plans and drawings where the title block matters and the border doesn't. Presentation handouts exported with wasteful padding.
Runs in your browser
The preview is rendered and the crop box written by JavaScript on your device — the PDF is never uploaded. Even large scanned files crop in a second or two, because nothing is re-rendered; only a few numbers change inside the file.
Tips
- All pages are cropped by the same margins, measured from each page's own edges — mixed page sizes are fine.
- Cropping too far? Re-run the tool on the original file; it's never modified.
- For pages scanned in different orientations, rotate them first with the Rotate PDF tool so the margins line up.