zerodatatools

Free browser tools for developers and AI practitioners. No account. No backend. No data leaves your device. Three tools live now: - Prompt Constructor — block-based LLM system prompt builder, export as Markdown/XML/plain text - Data Converter — CSV, JSON, Excel conversion, fully local - MCP Scaffold Generator — TypeScript, Python (FastMCP), or SKILL.md boilerplate Single HTML file. Works offline.