How to use Crop PDF
- 1
Open the PDF
Drop the PDF whose margins you want to trim, up to 50 MB and 200 pages. Its first page appears with a crop frame laid over it.
- 2
Set the frame
Drag the frame's edges and corners, or type exact margins in millimetres, inches or points.
- 3
Trim white space if you like
Press Detect white margins to measure where the content starts, and keep a small border around it.
- 4
Pick pages and crop
Apply the crop to all, odd, even or listed pages, press Crop PDF and download name-cropped.pdf.
Limits and Pro
One PDF at a time, up to 50 MB and 200 pages; white-margin detection checks every page you choose.
Pro crops PDFs of up to 4 GB with as many as 5,000 pages. See Pro
About Crop PDF
Crop PDF cuts the margins off PDF pages so that only the part you want is shown, printed and exported. It's useful for scanned books with thick grey borders, slides exported with wide white space, a receipt or a ticket sitting in the middle of an A4 sheet, or academic papers you want to read on a small screen without zooming in.
You can work visually or by numbers. The frame on the preview has eight handles and can be moved as a whole; the margin fields accept millimetres, inches or points and redraw the frame as you type, and the panel shows the size of the page that will remain. Detect white margins renders each chosen page on your device, finds the first and last rows and columns that hold anything darker than light grey, and proposes margins that keep a border of your choice. It can use one set of margins that cuts no content on any page, or fit every page to its own content.
The crop is stored the way PDF editors store it, in the page's crop box, which every reader respects. The cut area is hidden rather than erased, so text and images outside the frame are still in the file and come back if the crop box is reset in another editor. Turn on Shrink the paper size too to change the media box as well, which matters for print shops and some converters. Text stays selectable and links keep working.
Privacy
The crop frame, the preview and the white-margin detection run in this tab with PDF.js, and pdf-lib writes the new page boxes in a Web Worker, so the document never leaves your device. Nothing is stored after you close the page, and a password-protected file is decrypted locally by qpdf when needed.
Features
Visual crop frame
Eight handles, a movable frame and arrow-key nudges in 1 mm or 10 mm steps.
White-space detection
Measures each page's content and suggests margins with the border you choose.
Exact sizes
Margins in millimetres, inches or points, with the size of the cropped page shown.
Crop box or paper size
Hide the margins, or shrink the media box as well for printing.