Hidden Prompt Injection Text Scanner

A real scan, not a vibe check.

Prompt injection is ranked the #1 AI security risk by OWASP in 2026, with documented attack success rates of 50-84% depending on system configuration — and OpenAI itself has acknowledged that prompt injection in AI browsers 'may never be fully solved.' The core technique is indirect: an attacker hides instructions inside content an AI agent will read — a web page, an email, a document — using invisible Unicode characters, steganographic encoding, or CSS tricks that a human skimming the content would never notice. This tool runs real, deterministic checks against pasted text for exactly these techniques, rather than a subjective checklist.

• →Genuinely scans for zero-width Unicode characters (U+200B, U+FEFF, etc.) invisible to you but read by an AI model
• →Detects Unicode Tag block steganography — an entire hidden ASCII message encoded invisibly in normal-looking text
• →Matches known instruction-override and data-exfiltration phrasing patterns
• →Flags CSS/HTML hiding techniques (display:none, font-size:0, aria-hidden) when scanning pasted markup
• →Watermarked by Cikal Studio Labs · Works on any device, no install required