Are my PDFs uploaded?

No. Files are read locally with the File API and the crop runs in memory via pdf-lib. No network requests are made.

What does the tool actually modify?

It shrinks each page's MediaBox and CropBox by the values you supplied. Content streams (text and images) are left untouched — only the viewport rectangle becomes smaller.

What happens to content that lives in the trimmed area?

It becomes invisible in PDF viewers (clipped). The underlying data is still inside the file but no longer rendered. For a permanent removal you'd need to re-rasterize the PDF with a separate tool.

Can I use different margins per page?

Not in this tool — every page is trimmed uniformly. For per-page margins, split the PDF, crop each part separately, then merge them back.

What if I trim more than the page width / height?

The tool stops with an error to avoid creating a zero- or negative-sized page. Check the original page size and keep the sum of margins below it (A4 portrait is roughly 210mm × 297mm).

Can I crop password-protected PDFs?

Not directly. Decrypt them first with the PDF unlock tool, then run them through this tool.

Back to PDF

PDF crop — trim top / right / bottom / left in mm

Trim the top / right / bottom / left margins of each PDF page by a value in millimetres. Use it to cut off white borders from scans or shrink overly generous margins. Batch multiple PDFs and download as a ZIP. pdf-lib rewrites the MediaBox / CropBox without re-rendering, so quality is preserved and everything runs in your browser.

pdfcrop

How to use

Drop or choose one or more PDFs, then enter how many millimetres you want trimmed from each side. Tick 'Use the same value for all sides' to mirror the top value to every side. Click Trim margins and pdf-lib shrinks each page's MediaBox / CropBox to produce a new PDF. With multiple files, the Download ZIP button bundles them. Because only the box rectangles are rewritten (no re-rendering), there is zero quality loss.

FAQ

Are my PDFs uploaded?: No. Files are read locally with the File API and the crop runs in memory via pdf-lib. No network requests are made.
What does the tool actually modify?: It shrinks each page's MediaBox and CropBox by the values you supplied. Content streams (text and images) are left untouched — only the viewport rectangle becomes smaller.
What happens to content that lives in the trimmed area?: It becomes invisible in PDF viewers (clipped). The underlying data is still inside the file but no longer rendered. For a permanent removal you'd need to re-rasterize the PDF with a separate tool.
Can I use different margins per page?: Not in this tool — every page is trimmed uniformly. For per-page margins, split the PDF, crop each part separately, then merge them back.
What if I trim more than the page width / height?: The tool stops with an error to avoid creating a zero- or negative-sized page. Check the original page size and keep the sum of margins below it (A4 portrait is roughly 210mm × 297mm).
Can I crop password-protected PDFs?: Not directly. Decrypt them first with the PDF unlock tool, then run them through this tool.

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