How to use Crop PDF
Choose the PDF, enter the margin to trim from each side in millimetres, and type the pages or leave "all". Press Process PDF and download the cropped copy.
How much to trim
For reference, 10 mm is about 0.4 inches and 25 mm is about an inch. Scanner edges usually go with 5 to 10 mm. Wide white margins on slides exported to PDF often take 15 to 20 mm.
What cropping really does
A crop changes the visible area of the page. The trimmed part is hidden rather than deleted, so the file size barely changes and some PDF editors can undo it. To share only part of a page safely, print the cropped PDF to a new PDF afterwards.
How it works
The page crop box is reduced; content outside it is hidden, not deleted
Examples
- Worked example
Trim 10 mm from every side of a scanned page to remove the dark scanner edge.
Limitations and assumptions
Cropping hides the trimmed area rather than deleting it, so some editors can restore it. Pages need to stay at least half an inch wide.
Frequently asked questions
Does this work as a PDF trimmer for scans?
Yes. Trim 5 to 15 mm to remove the dark edges and shadows a scanner or phone camera leaves around each page.
Can I crop each side by a different amount?
Not yet. The same margin is trimmed from all four sides.
Will cropping make the file smaller?
Hardly. The hidden area stays in the file. Use Compress PDF for size.
Is my PDF uploaded?
No. The crop is applied inside your browser and the file never leaves your device.