How to crop a PDF
- Add your PDF. Drag it onto the box or click to browse. The tool reads it on your device and shows the total page count.
- Set your margins. Type how many millimetres to trim from the top, right, bottom and left. Leave a side at 0 to keep it as it is.
- Crop and download. Press Crop & download. The chosen margins are removed from every page and a new, cropped PDF downloads instantly.
- Need another? Click Choose another PDF to start over with a different file or different margins.
Why crop a PDF?
Scanned documents often arrive with thick white borders or a grey edge where the scanner glass ended. Slides exported to PDF can carry wide margins that waste space on screen and on paper. Cropping pulls the content back to the edge so the page looks tidy and reads larger when you zoom in. It is also handy before printing: trimming a few millimetres off each side can stop a document from spilling onto a second sheet, and it makes side-by-side reading on a tablet far more comfortable.
Because the same margins apply to every page, the whole document stays consistent, no page is left wider or narrower than the rest. The tool adjusts both the crop box and the media box, so the trimmed area is genuinely gone rather than just hidden, and the file opens, prints and shares exactly as you see it here. Everything runs locally with pdf-lib, so even sensitive contracts or medical scans never touch a server.
Frequently asked questions
Does it upload my PDF?
No, the crop runs in your browser; nothing leaves your device.
What units do the margins use?
Millimetres. Set how much to trim from each side and it applies to every page.
Does cropping change every page?
Yes, the same margins are applied to all pages so the document stays consistent.
What if my margins are bigger than the page?
The tool shows an error rather than making an empty page, so you can lower the values and retry.
Related: rotate a PDF · delete PDF pages · merge PDFs.