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