AI Unicode Detector

Web tool to detect invisible Unicode characters that LLMs inadvertently insert. Identifies 30+ character types, statistical pattern analysis (density, clustering, periodicity), heuristic automation likelihood evaluation, interactive distribution heatmap, automatic cleaning, multi-format export (TXT, JSON, CSV). Notable discovery: OpenAI o3/o4-mini were systematically inserting U+202F (confirmed as "RL quirk"). HTML5/CSS3/vanilla JavaScript.