zerodatatools
Free browser utilities. No account. No server. Ever.
zerodatatools launched on July 1, 2026 with 2 votes.
What it does
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.
Free browser utilities that process your data locally. Visual Prompt Constructor, CSV to JSON Converter, MCP Scaffold Generator. No signup. No server. No exceptions.
Build structured LLM system prompts with typed blocks. Role, context, constraints, format — composed visually. Convert CSV and Excel files to precisely typed JSON. Schema control, type enforcement, primary key indexing. Generate production-ready MCP server boilerplate (TypeScript, Python FastMCP) or Claude SKILL.md files. All processing happens in your browser. Nothing is transmitted to any server. Ever. Click a block type in the left panel to start building your prompt. Add blocks to see your prompt here. Copy Prompt Download .txt Saved you time? Keep it free. Click a block type in the left palette to add it to the canvas. Type your content, drag to reorder, toggle blocks on/off without…from sidehustlers113-ux.github.io
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