Entity Relationship Diagram Designer (ERD Designer) is a web-based tool for visually designing database Entity Relationship Diagrams (ER diagrams). 【KEY FEATURES】 ■ Graphical Design Environment Place tables with mouse operations and create relationships using drag-and-drop. Design complex database structures in an easy-to-understand visual format. ■ Versatile Export Options - Auto-generate DDL (PostgreSQL, MySQL, MS SQL Server) - Export ER diagrams as PNG images - Export table specifications (Google Spreadsheet format) ■ DDL Import Feature (Experimental) Automatically generate ER diagrams from existing database DDL. Useful for reverse engineering and database visualization. ■ Column Model Reuse Automatically register column definitions and reuse them across multiple tables. Maintain design consistency while improving work efficiency. ■ Schema Management Support for PostgreSQL and MS SQL Server schema management. Assign schemas to tables and reflect them in DDL output. ■ Perspective Feature Even with large ER diagrams, group tables and memos by function or purpose and switch between views. ■ Flexible Display Customization - Toggle between physical/logical name display - Color-code tables - Customize relation line styles 【SUPPORTED DATABASES】 PostgreSQL, MySQL, MS SQL Server This application is published as OSS at https://github.com/kajitiluna/erd-designer For detailed documentation, please visit https://github.com/kajitiluna/erd-designer/wiki