SMRTR ProgrammingJun 14, 2026Daily.dev

How to Build a Browser-Based PDF Crop Tool Using JavaScript

SMRTR summary

Build a fully browser-based PDF Crop Tool using JavaScript and the PDF-lib library — no backend required. Users can upload a PDF, preview pages, draw a crop selection, apply it to single or multiple pages, and download the result. A practical solution for cleaning up scanned docs, invoices, shipping labels, and more.

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