A database schema generator lets you visually design tables, columns, data types, and foreign key relationships, then export production-ready SQL CREATE TABLE statements for PostgreSQL, MySQL, SQLite, or SQL Server. Design your data model first, generate the SQL instantly.
Schema Builder
No tables yet. Click "Add Table" or load a template.
ER Diagram
Generated SQL
-- Add tables above to generate SQL
How to Use the Database Schema Generator
Designing a database schema by hand — writing CREATE TABLE statements from scratch, managing foreign key references, and adapting syntax for different databases — is tedious and error-prone. This free database schema generator lets you design tables visually and export production-ready SQL in seconds.
Step 1: Choose a Template or Start Blank
Click a template — Blog, E-Commerce, or SaaS — to pre-fill a realistic multi-table schema. The Blog template creates users, posts, comments, and tags tables with appropriate foreign keys. E-Commerce creates a full product/order schema. SaaS creates organizations, users, plans, and subscriptions. Or click "Add Table" to start from scratch.
Step 2: Define Your Tables and Columns
Each table has a name and a list of columns. Click "+ Add Column" to add a column. For each column, set the name, data type (INT, VARCHAR, TEXT, BOOLEAN, DATE, TIMESTAMP, UUID, DECIMAL, JSON, SERIAL, etc.), and constraints: Primary Key, NOT NULL, UNIQUE. Add a default value if needed.
Step 3: Set Up Foreign Key Relationships
Enable the Foreign Key toggle on any column to add a REFERENCES constraint. Select the referenced table and column from the dropdowns. The Relationships section below the builder will show all detected relationships as readable text (e.g., "orders.user_id → users.id"). The ER diagram updates automatically to show connecting lines.
Step 4: Select Your SQL Dialect
Use the dialect dropdown to target your database: PostgreSQL uses SERIAL for auto-increment; MySQL uses AUTO_INCREMENT; SQLite uses INTEGER PRIMARY KEY AUTOINCREMENT; SQL Server uses IDENTITY(1,1). The SQL output updates immediately when you change the dialect.
Step 5: Export Your Schema
Click Copy SQL to copy the statements to your clipboard, or Download .sql to save a file ready to run against your database. Use Download JSON to export the schema as a structured JSON object for use with ORM migration tools or to share with teammates. The database schema generator ensures all constraints, types, and dialect-specific syntax are correct before you export.
FAQ
Is this database schema generator free?
Yes, completely free with no usage limits. Design and export SQL schemas for any database without signing up or paying. All processing happens locally in your browser, so your schema data is never sent to any server.
Is my database schema data safe?
Absolutely. Everything runs client-side in your browser. Table names, column definitions, and relationships stay entirely on your device — nothing is sent to a server or stored anywhere except your browser session.
Which database dialects are supported?
The generator supports PostgreSQL, MySQL, SQLite, and SQL Server. Each dialect uses the correct syntax for auto-increment (SERIAL vs AUTO_INCREMENT vs INTEGER PRIMARY KEY AUTOINCREMENT vs IDENTITY), data types, and constraint notation.
How do I create a foreign key relationship?
Add a column to your table, then select its data type and enable the Foreign Key toggle. A dropdown will appear letting you pick the referenced table and column from any other table in your schema. The generator automatically adds FOREIGN KEY constraints to the SQL output.
Can I export the schema as JSON?
Yes. The Download JSON button exports your entire schema as a structured JSON object, which you can use with ORM tools, schema migration libraries, or to reload your design in other tools.
What are the template schemas?
The Blog template creates users, posts, comments, and tags tables. E-Commerce creates users, products, categories, orders, and order_items. SaaS creates organizations, users, plans, and subscriptions. Each pre-fills realistic column definitions and relationships to give you a head start.
Does the ER diagram update automatically?
Yes, the ER diagram canvas re-renders every time you add a table, column, or foreign key relationship. Tables appear as boxes listing their columns, and relationship lines connect foreign keys to their referenced tables.