OptiDrop

Adjust PDF Margins — Free Online Tool

Add, remove, or customize margins on PDF pages. Set top, bottom, left, and right margins in millimeters, or crop pages to their content boundaries. Preview changes before downloading. Everything runs in your browser — your files never leave your device.

Drop PDF Here or Tap to Browse

Supports PDF files only

No upload? Seriously. Files never leave your device.
100% Local — your file never leaves this device

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Adjust PDF Margins Online Free — No Upload Required

OptiDrop's PDF Margin Adjuster lets you add, remove, or customize the margins on any PDF document. Whether you need to add space for binding, increase margins for annotation, or remove excessive white space from exported documents, this tool handles it all — completely free and entirely in your browser. Your PDF files are never uploaded to any server, making it safe for confidential documents like contracts, financial reports, and personal records.

Add Custom Margins in Millimeters

Set precise margin values for top, bottom, left, and right sides in millimeters. Use the quick presets for common configurations like standard 10mm or 15mm margins, or the Binding preset that adds extra space on the left side for bookbinding. The visual preview shows you exactly how the margins will look before processing.

Remove Margins (Crop to Content)

The Remove Margins mode automatically detects the boundaries of visible content on each page and crops the page to fit. This is ideal for removing excessive white space from scanned documents, exported spreadsheets, or any PDF with unnecessarily large margins. Each page is analyzed individually, so pages with different content layouts are handled correctly.

100% Private — Browser-Based Processing

All margin adjustments are performed locally in your browser using the pdf-lib JavaScript library. Your PDF file never leaves your device — no server uploads, no file size limits imposed by us, and no waiting in queues. The tool works on desktop and mobile browsers alike, so you can adjust margins from anywhere.

Frequently Asked Questions

Upload your PDF by dropping it into the upload zone or clicking to browse. Enter your desired margin values in millimeters for top, bottom, left, and right. You can also use the Remove Margins option to crop pages to their content boundaries. Click Adjust Margins to process, then preview and download the result.
The Remove Margins option crops each page to the boundaries of its visible content. It detects where text, images, or graphics begin and end on each page, then resizes the page to fit snugly around that content. This is useful for removing excessive white space from scanned documents or exported files.
Yes. After adjusting margins, the tool shows a side-by-side preview comparing the original page dimensions with the new dimensions. You can see the exact page size in points and millimeters before downloading the adjusted PDF.
No. This tool runs entirely in your browser using the pdf-lib JavaScript library. Your PDF file is never uploaded to any server. All processing happens locally on your device, making it safe for confidential documents like contracts, financial reports, and personal records.

Last updated: June 2026