pdf-lib

pdf-lib is an open-source JavaScript library for creating and modifying PDF documents in Node.js and browser environments. It lets developers generate PDFs from scratch, edit existing files, merge or split pages, fill form fields, embed fonts and images, and draw text or graphics programmatically.

It is used by web developers, backend engineers, and teams building document workflows directly into applications. A distinguishing trait is that it works entirely in pure JavaScript without requiring native binaries or external PDF tools, which makes it easier to deploy in serverless, browser, and cross-platform setups.