Ghost Font Goes Viral: Readable by Humans, Unreadable by AI

An experiment named "Ghost Font" has recently gone viral. It encodes web text into a noisy dynamic video where letter pixels slide uniformly upward and background noise slides downward. Relying on motion perception, the human eye can instantly read the content, while multimodal AI models often treat it as pure noise during frame-by-frame analysis, leading to misreads or hallucinated text. This contrast offers a novel visual countermeasure against AI scraping and CAPTCHA cracking.

Key Details

Ghost Font differs fundamentally from standard static fonts: while traditional fonts leak text content via screenshots, Ghost Font relies on dynamic motion, making static screenshots carry almost no decodable information. Creator @petrusenko_max emphasized that even advanced models can be misled or hallucinate, and the screenshot itself does not leak content. Early poster @dioscuri also noted that AI vision models including GPT cannot decode it correctly, whereas human eyes can read it easily.

Tests and Reactions

A test reposted by @ZeroStateReflex showed that the font failed to be recognized correctly on both Fable and GPT-5.6 Sol Ultra. The original author used this to suggest that "true intelligence might be good at countermeasures." An article by @新智元 systematically explained the principle: models analyzing frame-by-frame treat the text as pure noise, while human eyes quickly recognize it through motion integration, which is the root cause of it being "human-readable but AI-unreadable."

2026-07-11 ~ 2026-07-13 · 5 related posts