ER Diagram Tool

Describe your app — "hospital with patients, doctors and appointments" — and get an ER diagram with tables, primary and foreign keys, data types and relationships. Export ready-to-run SQL.

  • Tables with PK, FK, NOT NULL, UNIQUE, defaults and auto-increment
  • Relationships with 1 / N cardinality
  • Import SQL CREATE TABLE or Mermaid
  • Export SQL for PostgreSQL, MySQL, SQL Server, SQLite — plus Prisma and Mongoose

How it works

  1. Describe the data or paste SQL
  2. The AI designs the tables and keys
  3. Edit columns in the table editor
  4. Export SQL or an image

Try it with

  • Hospital management system database
  • E-commerce store with orders and reviews
  • Library management system
  • College timetable and attendance

Frequently asked questions

Is it free?

Yes. Drawing by hand is always free and every account includes free AI credits. AI Flowchart Pro adds unlimited AI generation and every diagram type.

Can I generate SQL from the diagram?

Yes. One click gives CREATE TABLE scripts for PostgreSQL, MySQL, SQL Server or SQLite, with keys, constraints and indexes — or a Prisma or Mongoose schema.

Can I import an existing database?

Yes. Paste your CREATE TABLE statements (or a Mermaid erDiagram) and they become an editable ER diagram.

Can I export it?

Yes — PNG, SVG, PDF, PowerPoint with an editable slide, Mermaid code and draw.io. You can also share a live link or present it full screen.

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