How to Crop a PDF Page (and Remove Ugly Margins)
Cropping a PDF is not the same as cropping a photo. A PDF page has a defined size, and cropping changes which part of that page is visible — or changes the page size itself. Both are useful, and choosing the wrong one wastes time.
Two kinds of crop
Trimming the visible area keeps the page the same size and hides the edges. Printers and readers only show the crop box. The hidden content is still in the file, which matters if you later need it — and matters a great deal if you were trying to remove something sensitive.
Changing the page size actually rebuilds the page around the area you keep. The result is a genuinely smaller page with no hidden content.
For removing a scanner border, either works. For removing a confidential detail, only the second is safe — and even then, redaction is the correct tool.
Crop a page
- Open Crop PDF and add your file.
- Drag the crop handles to the area you want to keep. Leave a small margin — cropping tight to the text looks cramped and can clip ascenders.
- Apply to the page you are viewing, or to all pages if the document has a consistent border.
- Preview the result before saving. The crop box is easy to misjudge by a few millimetres.
- Save and check the first and last page.
Fixing scanner borders
A scanned page almost always has a dark strip along one edge from the scanner lid, plus a few millimetres of grey background. Cropping it off makes the document look as though it was made digitally.
Crop the same amount from every page — an uneven border down the side of a document is more distracting than the border was.
If the pages are also slightly rotated, straightening helps more than cropping. A two-degree tilt is visible on every line of text.
Common problems
- Text is cut off: the crop is too tight. Undo and leave a margin of at least 5 mm around the content.
- Pages are now different sizes: apply the same crop to all pages, or use the page-size option rather than the visible-area option.
- The old content is still there: you used the trimming method. It hides rather than deletes — use redaction if the content must be gone.
- The crop did not apply: some pages have their own rotation. Rotate first, then crop.
- Printing still shows the border: the printer uses the media box, not the crop box. Export or print with "use crop box" enabled, or rebuild the page size instead.
When cropping is the wrong tool
If you are trying to remove a name, an account number or a signature, crop hides it but leaves it in the file. Use Redact PDF, which deletes the content rather than covering it.
If the page is mostly empty because the scan was bad, rescanning at the right size produces a better result than cropping afterwards.
If you want a different aspect ratio for a screen, export the page as an image and crop that — PDF pages are paper shapes, images are not.
Privacy
Cropping is often the last step before sending something, which makes it the moment a document leaves your control.
A browser-based crop tool edits the page on your device. Nothing is uploaded, and the file you download is the only new copy.