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 - [mozilla/pdf.js](https://github.com/mozilla/pdf.js) - PDF Reader in JavaScript.
 - [agentcooper/react-pdf-highlighter](https://github.com/agentcooper/react-pdf-highlighter) - Set of React components for PDF annotation.
 - [Sioyek](https://sioyek.info/) - PDF viewer with a focus on technical books and research papers (desktop app).
+- [PDF Dark](https://pdfdark.org) - Convert any PDF to dark mode, fully in the browser. Open-source and client-side only — no upload required.