One-time setup: add the DjVu engine

Decoding DjVu needs one engine file (about 300 KB). This page could not download it by itself — that happens when the file is opened straight from your hard drive, or when your network blocks CDNs. Add it once and it works from then on:

1. Right-click one of these and choose Save link as… (Mac: Ctrl-click → Download Linked File):
   djvu.js — jsDelivr · unpkg mirror · official site
2. Save the file as djvu.js. It should be a few hundred KB.
3. Drop it on the box below (or click to browse). It is remembered on this device, so you only do this once.

Important: do not use Ctrl+S on the downloads page itself — that saves the web page, not the library. The real file is roughly 300–600 KB and starts with JavaScript code. Keep it next to this HTML file for next time.