PDF Dark turns any PDF into a real dark-mode file you can download, share, and reread anywhere. The entire conversion happens in your browser — your file never touches a server, verifiable in DevTools. A saturation-based algorithm preserves photos and charts in their original colors while darkening the rest. Output is a standard PDF (not a viewer toggle), so it stays dark on Kindle, iPad, Acrobat, anywhere. Free, MIT-licensed, no signup, no ads.

Features:

• 100% browser-side conversion, no upload

• Photos & charts stay in their original colors

• Output is a real dark PDF (works in any reader)

• Free and open source (MIT)

• Works on desktop and mobile browsers

Link: https://pdfdark.org

GitHub: https://github.com/1436941541/pdf-dark