Crop PDF

Trim the white border off scanned pages, cut a slide down to its content, or crop a page to just the part you need for a presentation. Enter exact margins in millimetres, or let the tool find the content and trim the white space automatically — page by page or with one box for every page. Nothing is re-encoded and the file is processed in your browser.

How to use this tool

1. Choose the PDF.
2. Pick “By margins I enter” and type how much to cut from each side, or pick “Trim white margins automatically” and choose how much space to keep around the content.
3. Optionally limit the pages, and keep “Also change the paper size” on so printers and every app use the cropped size.
4. Download the cropped PDF; the new page size is shown so you can check it.

Formula

New width = page width − left − right; new height = page height − top − bottom (all in mm; 1 mm = 2.835 pt). Automatic mode renders each page at 50 DPI and keeps the smallest box holding every pixel darker than RGB 245, plus your padding.

Margins are measured on the page as you see it, so they also work on landscape and rotated pages. “Same box for all pages” uses the union of all content boxes, keeping the pages the same size.

Example

An A4 scan (210 × 297 mm) with a 15 mm scanner border on every side, cropped with 15 mm margins, becomes 180 × 267 mm: 210 − 15 − 15 = 180 and 297 − 15 − 15 = 267.

Cropping hides, it does not delete

A PDF crop sets a smaller visible box on the page; the text and images outside it are still in the file and can come back if someone resets the box. That is fine for tidying margins, but not for removing confidential information — delete the page, or use a redaction tool that actually removes content.