Trim margins and crop pages — entirely in your browser, nothing uploaded

PDF files frequently arrive with oversized margins, scanner borders, watermark gutters, or excess whitespace that wastes paper and screen space. Whether you are preparing a document for printing on a specific paper size, removing the black borders left by a flatbed scanner, tidying up a research paper before sharing, or extracting a clean content area from a presentation slide, a PDF cropper is the fastest way to get the result you need without reformatting everything from scratch. Our PDF Cropper runs entirely inside your web browser using pdf-lib, a powerful JavaScript library that reads and modifies PDF files without sending any data to a server. Your document never leaves your device — a critical advantage over most online PDF tools that upload your files to third-party cloud servers. This makes our tool suitable for confidential reports, legal documents, medical records, and any other sensitive material you need to process privately. Cropping a PDF works by adjusting the CropBox — a metadata rectangle defined in the PDF specification that tells viewers which part of the page to display. The content outside the CropBox is hidden but not permanently deleted, which means the crop is technically non-destructive. You can always open the file in a full PDF editor later and restore the original margins if needed. This approach preserves text searchability, embedded fonts, vector graphics, and all other PDF features without recompression or quality loss. Using the tool is straightforward. Upload your PDF by dragging it into the drop zone or clicking to browse. Select your preferred unit (millimetres or inches) and enter the margin amounts you want to remove from each side: Top, Right, Bottom, and Left. A top margin of 20 mm, for example, removes 20 mm from the top of each page. You can apply the crop to all pages simultaneously or specify a custom page range such as 1-3,5,8-12 to process only the pages that need trimming. When you click Crop, the tool applies a CropBox to every target page in milliseconds and makes the resulting file available to download immediately. For common scenarios, use one of the built-in presets. "No Margins" sets all four margins to zero, which is useful when you want to remove crop marks added during print production. "Equal Margins" propagates the top margin value to all four sides in a single click. "Print Margins" adds standard 25 mm (1 inch) margins on all sides — helpful when you need to add breathing room to a document that currently bleeds to the edge. Because the tool runs locally, processing speed depends only on your device's CPU, not on server queue times or network bandwidth. A 200-page document with uniform margins typically completes in under two seconds on a modern laptop. There are no file-size limits imposed by server infrastructure — your browser's available memory is the only constraint, and modern browsers handle files up to several hundred megabytes without difficulty. PDF cropping is commonly used by students removing scanner shadows from scanned textbooks, office workers trimming presentation slides exported as PDFs, designers isolating artwork from a multi-page template, and publishers preparing print-ready PDFs from submissions. In each case, the ability to specify precise margin values in millimetres — matching real-world measurements — makes the tool far more accurate than visual drag-to-crop interfaces that depend on pixel estimation. After cropping, always review the result in a standard PDF viewer such as Adobe Acrobat, Preview (macOS), or your browser's built-in PDF viewer before distributing the file. Check that no essential content has been clipped at the edges, particularly on pages that may have slightly different layouts or margins than the first page. If a page range crop was applied, verify that the untreated pages still look correct.

Understanding PDF Cropping

How to Crop a PDF

Frequently Asked Questions