PDF Dark - PDF to dark mode in your browser

PDF Dark converts any PDF to true dark mode entirely in your browser. The conversion happens client-side, so your file never touches a server — easy to verify in DevTools. A saturation-based algorithm darkens text and backgrounds while preserving photos and charts in their original colors. Output is a standard PDF file you can download, share, and reread anywhere — Kindle, iPad, Acrobat — and it stays dark. PDF Dark is free, MIT-licensed, no signup, no ads. Built for night readers, students, researchers, privacy-conscious users, and anyone who wants to reduce eye strain on long PDF reads.