Crop PDF — Trim Page Margins in Your Browser

Choose a PDF Or drop one PDF here. Processing stays in this tab.

Margins to trim (points)

All sides (pt)

Top (pt)

Right (pt)

Bottom (pt)

Left (pt)

Changing “All sides” updates every edge; you can still fine-tune each side.

Crop PDF page margins in your browser by tightening the CropBox—nothing is uploaded to a server. Set top/right/bottom/left margins in points (default 36 each) or one value for all sides, then download. Example: a one-page sample crops 36 pt on every side and enables Download for cropped.pdf with before/after sizes. This is not a pixel drag editor; encrypted files fail with a clear error.

How it works

Choose one PDF, set margins in points (all sides or each edge), click Crop, then Download. Each page’s crop and media boxes shrink inward; viewers and printers respect the new bounds. Everything runs in this tab after the libraries load—your file is not uploaded to a server.

Rules you should expect

Margin math, PDF box behavior, limits, privacy, and failure cases for local PDF cropping.

Units: margins are in PDF points (pt). 72 pt ≈ 1 inch. Default sample uses 36 pt (½ inch) on each side.
Boxes: crop and media boxes shrink inward from each edge. Origin is bottom-left per the PDF spec.
Safety: if cropped width or height would be ≤ 10 pt, the tool rejects the settings before saving.
Privacy & limits: bytes stay in the tab; encrypted/corrupt PDFs fail clearly; huge files may be slow in memory.

Example

Sample builds a one-page PDF, crops 36 pt on all sides, and enables Download for cropped.pdf with size stats.

Good fits

Office: remove scanner white borders before printing or archiving.
Students: tighten handout margins so more content fits on screen.
Site owners: batch-trim the same margin on a one-page flyer export.

Frequently asked questions

Is my PDF uploaded?

No. The PDF library runs in your tab (scripts may load from a CDN). Your PDF is not uploaded to our servers.

How is this different from cropping an image?

This tool trims PDF page boxes by point margins—it does not let you drag a rectangle on a page preview like an image cropper.

Is this a pixel drag editor?

Correct. You enter margins in points (1/72 inch). There is no freehand box or pixel-level editing—use an image tool if you need that workflow.

What about encrypted PDFs?

Password-protected PDFs usually fail to open here. Remove the password with a tool you trust, then crop.

Questions or feedback

Something unclear, broken, or missing? Draft a message below — we read every note about these tools.

References

pdf-lib