Decoy Font uses hybrid-image trick to hide typed text from AI

Decoy Font

Mixfont released a free TTF font that stacks two letters per glyph using spatial frequencies: up close you see decoy text, from a distance the real message. Screenshots fed to ChatGPT and Gemini 3.5 with Thinking both read only the decoy layer. The technique is borrowed from the classic Einstein/Monroe hybrid image; the font is derived from DejaVu Sans Mono. The author notes that agentic or coding-capable models might eventually bypass it, so it's more useful against casual scraping. The post doesn't include robustness tests across font sizes or screenshot resolutions.

Why it matters: Strong concept and clear mechanism, with real screenshots adding credibility. Held back from 78+ because it's a single experiment, not a product launch or industry event.