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Database Schema Visualizer – Generate ERD Diagrams Instantly

Visualize SQL table relationships, detect normalization issues, and export diagrams for documentation or architecture reviews.

🟢 Runs locally · no uploads
SQL Schema
CREATE TABLE users ( id INT PRIMARY KEY, name VARCHAR(255), email VARCHAR(255) UNIQUE ); CREATE TABLE orders ( id INT PRIMARY KEY, user_id INT, total DECIMAL(10,2), FOREIGN KEY (user_id) REFERENCES users(id) );
Visualization
users
id: INT (PK)
name: VARCHAR
email: VARCHAR (UNIQUE)
orders
id: INT (PK)
user_id: INT (FK)
total: DECIMAL

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› About this tool · FAQ

Stop drawing database diagrams manually! Visualize database schemas with interactive ERD diagrams, analyze table relationships, detect normalization issues, and generate performance optimization suggestions. Supports MySQL, PostgreSQL, SQL Server, and Oracle DDL. Perfect for database design, documentation, and optimization. Free, works offline, unlimited visualizations.

How do I visualize my database schema?

Paste your SQL DDL, JSON schema, YAML, Prisma, or Sequelize models, select diagram format (Mermaid ERD, PlantUML, Graphviz), and click Visualize. The tool generates interactive ERD diagrams with relationships, constraints, and analysis insights instantly.

Is this database visualizer free?

Yes, completely free with unlimited schema visualizations. No signup required, no watermarks. Generate ERD diagrams for any database schema instantly in your browser.

Are database schemas uploaded to servers?

No, all schema visualization happens locally in your browser. Your database schemas, DDL statements, and diagrams never leave your computer for maximum security.

What input formats are supported?

Supports SQL DDL statements, JSON schema definitions, YAML configurations, Prisma schema files, and Sequelize model definitions.

What diagram formats can be generated?

Generates Mermaid ERD diagrams, PlantUML diagrams, Graphviz DOT notation, and structured text output. All formats support relationships and constraints.

What analysis features are included?

Provides normalization analysis, performance optimization suggestions, security vulnerability detection, and schema statistics for comprehensive database review.

Can it detect database design issues?

Yes, identifies missing indexes, normalization violations, security vulnerabilities, and provides optimization recommendations with implementation guidance.

Is it suitable for large database schemas?

Designed to handle complex schemas with multiple tables, relationships, and constraints. Provides grouping and filtering options for better visualization of large schemas.