Crop PDF margins online — offline & private

Shave away unwanted margins, scanner borders, or edge noise. Trim each edge independently using percentages of the page or absolute PDF points — cropped locally in your browser with pdf-lib, so your file never leaves your device.

How to Crop PDF margins online — offline & private

1. Step 1. Upload your PDF (it stays on your device).
2. Step 2. Enter how much to trim from the left, top, right, and bottom edges.
3. Step 3. Choose units: percentage of page size or PDF points.
4. Step 4. Execute — cropping happens locally in your browser — then download the cropped PDF.

Frequently asked questions

How do I remove the black border from a scanned PDF?

Crop a small percentage (1–3%) from all four edges — scanner borders usually disappear completely.

What is the difference between percentage and points?

Percentage trims relative to page size (same visual result on mixed-size documents); points are absolute 1/72-inch units from print layout.

Is my file uploaded to a server when cropping?

No. Cropping is 100% offline — the PDF is processed in your browser memory and never sent anywhere. Encrypted files are skipped with a warning.

Does cropping delete the margin content permanently?

The visible page area shrinks; content within the trim zone is no longer shown when printed or viewed.