Show HN: Filling PDF forms with AI using client-side tool calling

SimplePDF Copilot is an AI-powered PDF editor that enables client-side operations like form filling, field detection, and page deletion while maintaining privacy by keeping data in the browser. Built on a 7-year-old privacy-focused platform used by 200k+ monthly users, it leverages open-source tools like CommonForms and supports local or cloud LLM integration.