ER Diagram Tool

The ER Diagram Tool targets database designers and software architects who need to model schemas quickly in a browser. It captures entities as boxes, attributes as fields, keys as identifiers, and relationships with cardinalities. Projects store the diagram and allow versioning and collaboration without installing software. The system emphasizes domain logic: entity definitions, relationships, constraints, and export artifacts rather than presentation details.
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The tool represents the schema as a graph: nodes are entities, edges are relationships with multiplicities and optionality. It supports multiple notations (Crow’s Foot, Chen, UML) and can import SQL to populate the model, then validate normalization up to 3NF. Core features include entity/attribute editing, relationship definitions, notation selection, foreign-key inference, and dialect-specific SQL export, along with image exports (SVG/PNG). Use cases include designing a new schema, documenting an existing one, reverse-engineering from SQL, and training teams in data modeling.
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Unique value lies in online accessibility, collaboration, and consistent artifact generation for distributed teams. The tool outputs SQL, diagrams, and machine-readable exports to feed downstream tooling, version control, and documentation pipelines.