Crop PDF Pages Online: Trim Margins and White Space
Crop PDF pages online: trim margins independently in mm or percent, or remove white space from scanned documents in one click.
Updated 2026-08-16
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Features
- Trim top, right, bottom and left margins independently, in millimeters or percent of the page size
- One click removes white margins from scanned documents: the content area is detected automatically
- A4 standard margin preset applies typical document borders instantly, ready for print
- Crop the whole file or only a page range (e.g., pages 3–8); every other page keeps its original layout
- Live preview with a dashed crop box: you see exactly what stays before exporting
- Cut away scanner shadows, skewed edges and black page borders left by the scan
- Mixed page sizes handled per page: in an A4/letter file, percent values keep margins proportional on every page
- Cropping uses the PDF crop box, so text, images and links inside the kept area stay sharp, searchable and interactive
- Tidy up newsletters, certificates, wide tables and double-page spreads for cleaner print or screen reading
- Large PDFs stay smooth: pages render on demand for a responsive preview
How to Use
- 1Drag and drop a PDF, or click to open it: the first page appears with a crop overlay.
- 2Pick a unit: millimeters for absolute, print-accurate values, or percent of each page's size.
- 3Set the four margins: top, right, bottom, left. The dashed box marks the area that stays.
- 4Scenario: trimming an A4 document for print. Click A4 standard margins to apply typical 25.4 mm borders.
- 5Scenario: cleaning up a scan. Click Remove white margins and the content area of the current page is detected automatically.
- 6Choose the scope: all pages, or a page range such as 3–8 to crop only those pages.
- 7Browse with the arrow buttons or the page-number box to check pages with different layouts, like a letter-size insert in an A4 document.
- 8Click Crop PDF to build the output: processing runs locally and usually takes about a second.
- 9Save the cropped file with the button in the result panel.
- 10Done? Click Clear or open another PDF, and everything resets automatically.
Frequently Asked Questions
How do I crop a PDF?
Open the PDF, set the four margins (top, right, bottom and left) in millimeters or percent, then click Crop PDF. The dashed overlay shows exactly which area stays before you export.
How do I remove white margins from a PDF?
Click Remove white margins: the tool renders the current page, detects the content area and fills in the exact margins automatically. Then crop all pages or a range with those values.
How do I trim pages in a PDF?
To trim an equal border from all four sides, set the same value in each margin field and apply it to all pages at once. Millimeter values are converted per page automatically, so mixed page sizes stay proportional.
Can I crop specific pages of a PDF?
Yes. Switch the scope from All pages to Page range and enter the range, for example 3-8. Only the pages in the range are cropped; the rest keep their original layout.
How do I cut off scanner shadows or black edges?
Set a small margin on the affected side (or use Remove white margins first) and apply it to the scanned pages. Cropping removes the dark border while keeping the document content intact.
Can I crop a PDF to A4 size?
It depends on what you mean. If the page is already A4 and just has wide white margins, yes: trim the margins and the content area becomes clean A4. But if the page itself is a different size (letter, A3, or a photo page), this tool trims margins and does not rescale or reflow content, so the output keeps the original page size. For true resizing to A4, use a scaling tool or the print-to-PDF option with A4 paper settings.
Do I need Photoshop or Word to crop a PDF?
No. Everything happens in your browser: open the page, drop in the PDF, set the margins and export. You do not need Photoshop, Word, Acrobat or any other software, and there is nothing to install.
How do I crop a PDF with different page sizes?
The tool handles mixed sizes per page. In percent mode, the margin scales with each page, so an A4/letter mix keeps the same proportions on every page. In millimeters, the value is absolute, identical on all pages regardless of size. Pick the unit that matches your document: percent for proportional results, millimeters when every page should lose the same amount.
Can I undo a crop?
Yes, your original file is never modified, so nothing is lost. Cropping always produces a separate output file, and the source PDF on your disk stays exactly as it was. Reopen the original and the document is fully intact, so you can try different margins as often as you like.
What unit should I use: mm or percent?
Millimeters are best for exact, print-oriented trimming: the value is the same on every page regardless of size. Percent is convenient when the white space differs between page sizes.
Does cropping remove text or images inside the page?
No. Cropping only cuts the outer area you specify: text, images, links and annotations inside the kept area remain fully intact and interactive.
Why does the crop look different on some pages?
Percent margins scale with each page's size, so mixed A4/letter documents keep proportional margins. Millimeter margins are identical everywhere; if a page looks cut oddly, switch units or crop a specific range.
Remove white margins seems wrong. What now?
Very dark or full-bleed backgrounds can confuse auto-detection. Switch the unit to percent, lower the detected values slightly, or set the margins manually for the pages that need it.
Can I crop a PDF on my phone?
Yes. The preview, margin inputs and presets are fully responsive and touch-friendly, so you can trim pages on any phone or tablet.
My PDF is password protected. Can I crop it?
No. Encrypted PDFs cannot be opened by the tool. Unlock the document in your PDF reader first, then crop it here; note the result is not password protected either.