Merge PDF in JavaScript: pdf-lib and PDF.js Explained
Merge PDFs in the browser or Node.js using pdf-lib. Full code walkthrough — load documents, copy pages, save result — all without a server.
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Tags: pdf, javascript, developer-tools, merging
Merge PDFs in JavaScript: pdf-lib Client-Side Guide is a TypeScript/JavaScript library for creating and modifying PDF files that runs equally well in Node.js and in the browser. It is the backbone of most modern client-side PDF tools, and it handles PDF merging with excellent fidelity. This guide covers the full workflow: loading PDFs, copying pages, saving the merged output, and triggering a browser download. Why pdf-lib for Browser-Side Merging? Before pdf-lib, client-side PDF manipulation in browsers was limited to low-level hacks or server round-trips. pdf-lib changed this by providing a complete PDF manipulation API that: Works without any server — pure browser-side execution Handles modern PDF features: images, fonts, forms, annotations Produces standards-compliant PDF output Has…
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