Create ER Diagrams with AI
Describe your database schema—tables, columns, keys, and relationships—and AI converts it into a structured ER diagram with correct cardinalities and notation.
Try ER Diagram Maker
AIで図表を即時生成。まずは説明を入力してください。
クイック例：
Current selected: Entity Relationship Diagram
図表タイプを選び、説明文を入力してください
Create ER Diagrams in 3 Steps
From schema description to visual database model
Describe Tables
List tables, fields, primary/foreign keys, and relationships using natural language.
AI Generates Diagram
AI builds an ER diagram with PK/FK markers, cardinalities, and structured layout.
Implement Database
Use the diagram for schema planning, migration design, documentation, or team alignment.
登録不要 · 無料 · 今すぐ使用開始
ER Diagram Features
Professional database design with AI assistance
- Cardinality Notation
- Visualize one-to-one, one-to-many, and many-to-many relationships with correct crow’s-foot notation.
- Primary & Foreign Keys
- Automatically mark PK and FK fields to clarify table roles and constraints.
- Data Types Included
- Optionally show column data types, constraints, and nullability.
- Normalization Support
- Use the ER diagram to evaluate normalization and reduce redundancy.
ER Diagram Maker FAQs
- Which databases are supported?
ER diagrams work for PostgreSQL, MySQL, SQL Server, Oracle, SQLite, MariaDB, and any relational database.
- Can I show composite keys?
Yes. Mention which fields form the composite key and AI will annotate them correctly.
- Is this useful for ORM or backend design?
Absolutely. ER diagrams help structure entities before using ORMs like Sequelize, Hibernate, Prisma, or Entity Framework.
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