2 months ago
- Decoy Font is a TTF font that prints a decoy for every letter to make it harder for AI to read text.
- It uses separate spatial frequencies to display two letters in the same space: thin outlines in the foreground and low-frequency blurred background.
- AI systems focus on the foreground text, but from a distance or with squinting, the hidden message becomes readable.
- The font is free for personal, commercial, and client projects, derived from DejaVu Sans Mono.
- Decoy Font is part of anti-AI fonts to protect information from AI scrapers, using hybrid image techniques.
- It can trick advanced LLMs like ChatGPT, GPT Sol, and Gemini 3.5, and exists as an installable TTF file for typing text.
- Future applications could include CAPTCHA, private messaging, and extending to character-based languages like Chinese.