ERD Diagram Maker Online
Create interactive flowcharts, mind maps, and node diagrams with custom shapes and precise cardinality notation. Free, fast, and runs 100% in your browser.
Designing a database schema starts with a clear Entity-Relationship Diagram. ZamDev Flow provides a dedicated ERD palette with strong entities, weak entities, relationships, key attributes, multivalued attributes, derived attributes, and composite attribute templates — all using proper Chen notation. Connect shapes with cardinality markers (one-to-one, one-to-many, many-to-many) and let the AI builder scaffold entire schemas from a text prompt. Save your ERDs to the cloud or export as PNG and JSON for documentation.
Feature Overview
| Feature | Details |
|---|---|
| Chen notation symbols | ✓ |
| Cardinality markers | ✓ |
| AI diagram generation | ✓ |
| Cloud save | ✓ |
| Export PNG/JSON | ✓ |
Frequently Asked Questions
Does it support Chen notation?
Yes. The ERD tab provides all Chen notation symbols: strong and weak entities, relationships, and all attribute types including key, multivalued, derived, and composite.
Can I add cardinality markers?
Yes. Select any connection and choose from One, Many, Zero-or-One, One-or-Many, or Zero-or-Many notation for both source and target ends.
Can I generate an ERD with AI?
Yes. Describe your database schema in plain English and the AI builder generates the complete ERD with entities, attributes, and relationships.