Free AI ER Diagram Generator

Transform database descriptions into professional entity-relationship diagrams instantly. Describe your entities, attributes, and relationships - AI creates the ERD.

0 / 10,000

A real ER diagram from one paragraph

No notation, no DDL — just a description.

Whiteboard with three rectangular database table sketches labelled Users, Orders, Products connected by relationship lines

Input

Generated ER diagram with entity tables, primary and foreign key markers, and labelled relationships

What the AI produces

The "track quantity and unit price on the order-line" phrasing triggers OrderLine as a separate entity with composite PK — the AI handles this without you specifying it.

What is an ER diagram generator?

Describe entities, their attributes, and the relationships between them — "customers can place many orders; each order has one or more line items pointing to a product" — and Flowova produces an entity-relationship diagram with primary keys, foreign keys, and standard cardinality notation (1, N, M:N). It also works in reverse: paste a CREATE TABLE statement or DBML and the schema becomes a diagram. Useful for documenting an existing database, designing a new one, or reviewing a migration before you ship it.

Written by Lin Park

How to Generate an ER Diagram

1

Describe Your Database

Type or paste a description of your database: entities, attributes, and how they relate. Use plain English ("a customer can place many orders") or paste DDL/JSON schema — the AI parses both.

  • Plain English: 'a customer has many orders'
  • CREATE TABLE, DBML, or JSON Schema accepted
  • Specify Chen or Crow's Foot in your prompt
2

AI Creates Your ERD

Flowova identifies entities, primary keys, foreign keys, and cardinality (1:1, 1:N, M:N). It picks Chen or Crow's Foot notation based on your description and resolves many-to-many relations into junction tables when appropriate.

  • Primary keys, foreign keys, indexes marked
  • Cardinality: 1:1, 1:N, M:N notation
  • Many-to-many resolved to junction tables when implied
3

Customize and Export

Refine attribute types inline, mark primary/foreign keys, regroup entities by domain, and export. Pro accounts can ask the AI Chat Agent things like "split user table into auth and profile" or "denormalize the audit log."

  • Edit attribute types inline
  • AI Chat Agent (Pro): 'split user table into auth and profile'
  • Free PNG; SVG and Mermaid are Pro

ER Diagram Generator Features

Three table-shaped rectangles labelled Customer, Order, Product connected with 1:N notation

Plain English to Schema

"Customers can place many orders; each order has line items pointing to products" generates four tables with PK, FK, and 1:N relationships labeled.

Hand-lettered CREATE TABLE SQL code block above a pen-drawn entity rectangle

DDL and DBML Input

Paste a `CREATE TABLE` block or a DBML schema and the diagram is generated from the structure — no AI inference, exact field-for-field rendering.

Chen-notation diamond on left and crow's-foot notation lines on right separated by a divider

Chen or Crow's Foot Notation

Specify your preferred notation in the prompt ("use Crow's Foot") — the diagram switches between the two industry-standard cardinality systems.

Table with three field rows badged PK, FK, and UQ

PK / FK / Unique Constraints

Primary keys marked with PK suffix, foreign keys with FK, unique constraints with UQ. Composite keys render with multiple PK markers on the entity.

Three entity rectangles — Product, Order, OrderLine junction — connected by lines

Junction Tables for M:N

Many-to-many relations ("a product appears in many orders, each order has many products") resolve to an OrderLine-style junction table automatically.

Chat bubble saying split user table with arrow pointing to two entities Auth and Profile

AI Chat Agent for Refactors (Pro)

"Split user table into auth and profile", "Denormalize the audit log into the events table" — schema refactors via natural language.

When to use the ER diagram generator

Use this tool for

  • Designing a new database schema from product requirements or user stories, before writing migrations.
  • Documenting an existing schema for new-engineer onboarding, tech-debt audits, or migration planning.
  • Communicating the data model to PMs, designers, or leadership who don't read DDL fluently.
  • Diagram artifacts for technical specs, RFCs, architecture reviews, or compliance documents.

Use a different tool for

  • How data moves between systems at runtime — Data Flow Diagram Maker captures the architecture; an ER diagram describes the static schema.
  • Class diagrams or OO domain models with inheritance and methods — a UML tool like PlantUML or StarUML is closer to the right shape.
  • Production-ready migration SQL — generate the design here, then write the DDL or use a migration framework (Prisma, Drizzle, Alembic, Liquibase).
  • NoSQL document structures for MongoDB or DynamoDB — ER notation is built around tables and joins; dbdiagram.io or Hackolade with custom shapes fits document modeling better.

ER Diagram Generator FAQ

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Free AI ER Diagram (ERD) Generator Online | Flowova