Related diagrams
ER Diagram Maker
Design an entity-relationship diagram for tables, keys, and cardinalities. Start from the template for schema reviews before migrations, then export for backend or DBA review.
Features
- Live editor for er diagram maker
- Starter template included on the page
- PNG and SVG export
- No install required
Need a blank canvas? Open the full UML studio.
What you can model
ER diagrams emphasize persistence: entities, primary keys, foreign keys, and cardinality. Teams often call the same job a database diagram or ERD. Use this view when the contract is tables and relations.
How to use this maker
Add entities, mark keys, set relationships, preview, then export for DBA or backend review. Name tables as they appear in SQL when that is the contract.
Notation that matters
Entities list attributes. Primary and foreign keys should be obvious. Cardinality marks such as one-to-many sit on relationship ends. Keep attribute types aligned with your migration plan.
Keep the diagram readable
ER focuses on data storage. Class diagrams focus on object types and behavior. Use a data flow diagram when the question is how data moves between processes, not how tables relate.
Frequently asked questions
Is this ER diagram maker free?
Yes. Create and export online without a subscription.
Is an ERD the same as a database diagram?
Teams often use the names for the same job: showing tables and relations. This page covers that modeling need.
ER diagram vs class diagram?
ER focuses on data storage. Class diagrams focus on object types and behavior.
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