Show HN: PDF.chat

PDF.chat is a web app that lets you upload a PDF and then ask questions about its contents in natural language — it uses an AI (likely a large language model) to "read" the document and answer. This is part of a wave of "chat-with-your-documents" tools that emerged after ChatGPT proved how well LLMs can handle text. The "Show HN" in the title means it was posted on Hacker News, a tech-community site where developers share side projects and startups. The key context: while many such tools exist (e.g., ChatPDF, AskYourPDF), making one that actually works well requires handling large documents, preserving layout (tables, figures), and keeping response costs low — so each new entry tries to differentiate on speed, accuracy, or privacy. The maker is likely seeking early users and feedback from the HN crowd.