PDF Crop and Resize is a free browser-based tool that adjusts the visible page dimensions of a PDF by cropping margins or resizing pages to a standard paper size. Cropping removes unwanted white space from the edges of pages, which is a common issue with scanned documents that have large borders or PDFs exported with excessive margins. Resizing scales the page content to fit a standard size such as A4 or Letter, which is useful when preparing a PDF for printing on a specific paper size. The tool applies the selected crop or resize operation to all pages and outputs a new PDF. It runs entirely in the browser using pdf-lib with no file sent to a server. Changes are applied to the PDF page box definitions, so the operation does not degrade image quality. No account or installation is required. PDF Crop & Resize is commonly used as a convert pdf to a4, making it a practical choice for everyday tasks directly in the browser. In a typical pdf workflow, PDF Merger can combine multiple PDFs into a single document, PDF Watermark can add watermarks to PDF pages, and PDF Rotate can rotate PDF page orientation.
PDF Crop and Resize addresses two related but distinct problems in PDF page dimensions. Cropping is used when a PDF has oversized margins, either from scanning with too much border included or from exporting with padding that the recipient does not need. By reducing the crop box to trim the white space, the visible content area of each page becomes larger relative to the page, making the document easier to read on screen and reducing paper waste when printed. Resizing is used when the page dimensions of a PDF do not match the paper size required for printing. A PDF exported from a design tool at custom dimensions needs to be resized to A4 or Letter before it can be printed correctly on standard paper without scaling artifacts. The tool applies these adjustments by modifying the PDF page box metadata, specifically the CropBox and MediaBox values, rather than rasterising and re-encoding the page content. This means the operation is non-destructive to the original image data, preserving the quality of embedded images and the crispness of vector content. The adjusted PDF is compatible with all standard PDF viewers and print workflows. Because the tool processes files entirely in the browser with no server upload, it is appropriate for use with confidential documents. It works across all modern browsers on desktop and mobile without installation.