GoKawiilWhat is Ghost Font?
Ghost Font is an anti-AI font that writes a message using motion. Using a combination of motion, video, noise, and decoys, it's a unique way to share a message with other real humans. I suppose technically, it's not a font in the traditional sense of a TTF font file. But, Ghost Font is an experiment of a way to graphically communicate in writing in a format that AI cannot easily understand. While it's not as legible as regular text, the letters are still immediately readable to a human eye, but even leading AI models can't decipher it easily.
Your browser does not support the video element. Example video generated with Ghost Font.
Videos generated with Ghost Font were then passed to leading AI models like Claude Fable and GPT Sol 5.6 Ultra. Even these recent agents, with the ability to code, struggled to decode the moving message until prompted with the exact technique to look for.
GPT-Sol 5.6 Ultra attempting to decode a message written with Ghost Font. The model reads the hidden decoy message, but fails to read the actual moving message. Claude Fable with Max reasoning attempting to decode a message written with Ghost Font. The model reads the hidden decoy message, but fails to read the actual moving message.
The playground above is just a prototype of this concept. Type a few words and the letters appear but only because the motion of the dots is visible to a human eye.
When the video is paused, the static dots blend together, and it becomes impossible to tell just from looking at a single frame what message is embedded in the image. That means that screenshotting the page won't reveal the message.
This experiment works locally—type the message and preview it live, or download the video to share and test it out yourself. The data is not shared or sent to any server.
About this project
In 2013, designer Sang Mun released a font called ZXX. It was a typeface with four fonts designed to be readable by humans but not by optical character recognition (OCR) software. The letters were camouflaged with noise, crossed out, and buried under false marks. At the time, this font was deemed "surveillance-proof"—but fast forward to today, and modern AI agents can easily read text rendered in ZXX.
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