Crop PDF Margins — Remove White Borders Online Free
Automatically detect and crop white borders from your PDF pages. Auto or manual mode — clean, compact result. Free, no sign-up.
How to crop PDF margins
- 1Upload your PDF file
- 2Choose auto mode (threshold + padding) or manual mode (custom margins)
- 3Click 'Crop Margins'
- 4Download the cropped PDF
Features
- Auto mode detects content boundaries per page for precise cropping
- Manual mode applies uniform custom margin values to all pages
- Adjustable padding to preserve a minimum border around content
- Processed in your browser — files never uploaded to a server
When it's useful
- Remove large white margins from scanned books or academic articles
- Prepare PDFs for reading on e-readers or small-screen devices
- Crop research papers to content-only for compact printing
FAQ
What is the threshold setting?
Threshold controls how close to white a pixel must be to be considered background. Raise it to crop more aggressively.
Can I add padding after cropping?
Yes. Set padding to preserve a small margin around the content.
What is the difference between auto and manual mode?
Auto mode scans each page and determines crop boundaries from content. Manual mode applies identical margins to all pages.