Does the AI understand database cardinality?

Yes. The AI generates correct Mermaid ER syntax with proper cardinality notation including one-to-one, one-to-many, many-to-many, and zero-or-more relationships.

Can I generate an ER diagram from my SQL schema?

You can paste your CREATE TABLE statements or describe your existing schema in the prompt. The AI will create a visual ER diagram from the description.

What notation does the generated ER diagram use?

Generated diagrams use Mermaid's ER syntax which supports Chen notation for cardinality. Entities display attributes with type information and key designations (PK, FK).

Is this suitable for production database design?

It's a great starting point. The AI generates a solid initial design that you should review and refine based on your specific performance, normalization, and indexing requirements.

AI-Powered

Free AI ER Diagram Generator

Describe your database tables and relationships in plain English — our AI generates a professional entity-relationship diagram with correct cardinality.

5/5 credits

How It Works

Describe your database

Explain the entities (tables), their attributes, and how they relate to each other. Mention cardinality if you know it.

AI models the schema

Our AI identifies entities, attributes, primary keys, foreign keys, and relationship cardinality (one-to-one, one-to-many, many-to-many).

Edit and export

Adjust data types, add constraints, and refine relationships in the full editor. Export as PNG, SVG, or PDF.

What You Can Create

•Design database schemas for new applications
•Document existing database structures
•Plan data migrations and schema changes
•Create ERDs for technical documentation and RFPs
•Visualize relationships between domain entities

Learn ER Diagram Syntax

View the complete syntax reference, examples, and best practices for Mermaid er diagrams.

Export Options

PNG Export

High-resolution images for documents and presentations.

SVG Export

Scalable vectors for web and further editing.

PDF Export

Print-ready format for professional documentation.

Frequently Asked Questions

Ready to generate your er diagram?

Describe what you need above and let AI do the work — or open the full editor to build from scratch.

Open Full Editor