ER Diagram Tool for Database Design
Describe tables and relationships in text and get a clear database diagram for docs and reviews.
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Help shape ER Diagram Tool for Database Design
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Frequently Asked Questions
Add PK, FK or UK after a column, e.g. int customer_id FK.
||--o{ means one-to-many (optional), ||--|{ one-to-many (required) and ||--|| one-to-one.
Not directly yet — write the tables as text, or query your schema with the SQL Playground.
Yes: PNG up to 4×, SVG, or a Markdown block that GitHub renders.
No. Diagrams render in your browser and are saved only in local storage. Nothing is sent unless you choose a mermaid.live or mermaid.ink link.