ER Diagram Designer

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Design entity-relationship diagrams visually. Create database schemas with tables, columns, data types, and relationships. Import SQL, Laravel/Rails/Django migrations. Export to MySQL, PostgreSQL, SQLite, or SQL Server.
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How to Design Effective Database Schemas

Entity-Relationship (ER) diagrams are essential tools for database design. They visually represent tables, columns, and the relationships between entities in a database system.

Key Concepts

  • Entities (Tables) — Represent real-world objects like Users, Products, or Orders.
  • Attributes (Columns) — Properties of entities such as name, email, or price.
  • Relationships — Connections between entities (one-to-one, one-to-many, many-to-many).
  • Primary Keys — Unique identifiers for each record in a table.
  • Foreign Keys — References to primary keys in related tables.

Import & Export

  • Import SQL files from any database to visualize existing schemas
  • Import Laravel, Rails, or Django migration files to auto-generate diagrams
  • Export to MySQL, PostgreSQL, SQLite, or SQL Server with proper syntax
  • Foreign keys and indexes are included in SQL exports

Best Practices

  • Normalize your schema to reduce data redundancy
  • Use meaningful table and column names
  • Define proper data types for each column
  • Add indexes for frequently queried columns
  • Document relationships clearly

Frequently Asked Questions

Can I export my ER diagram as SQL?
Yes! Export to MySQL, PostgreSQL, SQLite, or SQL Server. The export includes CREATE TABLE statements with foreign key constraints and indexes.
What relationship types are supported?
The designer supports one-to-one, one-to-many, and many-to-many relationships between tables.
Can I import an existing schema?
You can import JSON schemas, SQL files (CREATE TABLE statements), or migration files from Laravel, Ruby on Rails, and Django.
How do I add foreign key relationships?
Drag from one table's handle to another table's handle to create a relationship. By default it creates a one-to-many (1:N) relationship.
Is my data stored on a server?
No. Everything runs entirely in your browser. Export your schema as JSON or SQL to save your work locally.