Crop PDF: how it works
To crop a PDF, open the Crop PDF tool, add your file, trim the margins on the pages, and download. Cropping is applied in your browser and the file is never uploaded.
How to use Crop PDF
- Open the Crop PDF tool and add your PDF.
- Drag to set the crop area / trim the margins.
- Download the cropped PDF.
In your browser vs. uploading to a server
Best for removing wide scanner margins or focusing on part of a page before printing.
Frequently asked questions
How do I crop the margins of a PDF?
- Open the Crop PDF tool, set the crop box, and download; the margins are trimmed on every page in your browser.
Are my files uploaded to a server?
- No. PDFER runs entirely in your browser using WebAssembly and JavaScript. Your files are read into memory on your device, processed locally, and never sent to PDFER or any third party. Closing the tab or leaving the tool erases them from memory.
PDFER is a privacy-first PDF toolkit built by Kiril Urbonas. Every tool runs entirely in your browser — see our security model and privacy policy.