dbdiagram.io

About dbdiagram.io

Free, simple tool to draw Entity-Relationship diagrams by just writing code. Designed to help developers design and visualize database structures in a straightforward and intuitive way. Perfect for quickly sketching database schemas and sharing them with your team through simple DSL syntax.

Key Features

• 1DBML (Database Markup Language) for text-based schema definition
• 2Auto-generates visual ER diagrams from DBML code
• 3Export schemas as SQL DDL for PostgreSQL, MySQL, and other databases
• 4Collaboration features for sharing and commenting on schema designs
• 5Version-control-friendly plain text format for schema evolution tracking

How Python Data Engineers Use dbdiagram.io

Python data engineers use dbdiagram.io to design and document data models before implementation. The DBML text format can be stored in Git alongside Python pipeline code, making schema changes reviewable in pull requests. The SQL export generates DDL that can be applied directly via SQLAlchemy or Alembic migration scripts.