How to Build a Browser-Based PDF Cropper Using Vue 3 and pdf-lib

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A technical guide published on DEV Community demonstrates how to crop PDF pages entirely within the browser using Vue 3, pdf-lib, and PDF.js — eliminating the need for server-side processing. The approach keeps user files on their device, works offline after the app loads, and avoids privacy risks associated with file uploads. The core mechanism relies on pdf-lib's setCropBox method, which adjusts the visible area of a page without altering its underlying content. An interactive canvas overlay powered by PDF.js lets users visually drag crop margins before applying changes. The full source code is publicly available on GitHub, and a working implementation can be explored at en.sotool.top/crop-pdf.

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