CodeASystem PDF tools
Read PDFs in dark mode.
Invert white backgrounds to dark tones and switch text to crisp light colors for strain-free reading at night locally.
Invert PDF Colors (Dark Mode)
Convert bright white PDF documents into high-contrast dark mode for eye-friendly night reading.
Processing happens entirely inside your browser. No files are uploaded to any server.
How it works
On-device dark mode rendering. Zero uploads.
Upload your PDF document to invert color channels. The tool renders every page into high-definition bitmaps using WebAssembly, inverts RGB values directly in memory, and re-packages the document into a lightweight PDF without cloud uploads.