Doing PDF work entirely in the browser is a nicer story than it sounds. pdf-lib loads a document from an ArrayBuffer , gives you pages as objects, and hands back bytes — no server, no upload, no retention policy anyone has to trust. The happy path is about fifteen lines.
Source: [Dev.to](https://dev.to/bellsal_b44bf6d/what-actually-breaks-when-you-process-pdfs-in-the-browser-4o91)