Entity-Relationship Diagram Editor

ER diagram generator. Paste CREATE TABLE statements and get a clean, interactive ERD — runs 100% in your browser, nothing uploaded

ERD Builder Pro is a professional-grade, high-performance web application designed for developers and database architects to build, document, and visualize complex data structures. Built with a modular architecture and modern tech stack, it offers a seamless experience for database design and technical documentation.

Generate and render Mermaid diagrams for architecture docs, READMEs, PRs, terminals, and CI as themed SVG or ASCII/Unicode art. Use this skill whenever the user provides Mermaid code or .mmd files; asks for a flowchart, sequence/state/class diagram, ERD, XY chart, or architecture/workflow/data-model visualization; or wants to beautify, theme, batch-convert, or make a diagram terminal-friendly. Runs locally without a browser or DOM, with 15 built-in themes and custom colors.