PDF Auto Crop renders PDF pages locally in your browser, detects content bounds, and removes black borders, white margins, and extra whitespace from scanned documents. It is useful for document cleanup, contract archiving, invoice scans, and print preparation.
Key Features
- Upload or drag a single PDF file.
- Process all pages or a page range.
- Adjust render scale, grayscale threshold, ignored edges, crop padding, and minimum content area.
- Rebuild cropped PDF pages with JPG or PNG output.
- Keep unselected pages unchanged to avoid losing pages outside the chosen range.
- File reading, cropping, and export run locally in the browser.
How to Use
- Upload a PDF file or drag it into the tool area.
- Enter a page range such as
1,3-5,8, or leave it empty for all pages. - Adjust detection options if needed. The defaults work for most scans.
- Click “Start Auto Crop” and wait for local processing to finish.
- Review the result summary and download the new PDF.
Option Notes
- A higher grayscale threshold makes light text and pale content easier to detect.
- Edge ignore reduces the effect of scan shadows, black borders, and binding edges.
- Crop padding adds space around detected content to avoid overly tight crops.
- Minimum content area prevents tiny noise from being treated as real content.
Privacy
This tool reads, renders, crops, and exports PDF files locally in your browser. It does not actively upload file content to a server.