Free online database diagram app

ERD Generator for SQL schemas

Paste CREATE TABLE statements, generate an entity-relationship diagram, inspect keys and relationships, then export the result for documentation, planning, or pull requests.

Launch ERD GeneratorOpen the full-screen diagram workspace Runs locally in your browser. Your SQL stays on your device.

SQL to diagram
Foreign key validation
Manual table editor
PNG, PDF, JSON, Mermaid, SQL export

ERD Generator app showing SQL input, relationship diagram canvas, validation panel, and export options — Live app preview: SQL input, draggable diagram canvas, validation checks, and export tools.

How the ERD Generator works

The app is built for quick database design sessions. Start with SQL, generate the diagram, refine the schema visually, and export in the format your team needs.

Paste SQL or load a template

Add CREATE TABLE statements or start from built-in templates like e-commerce, blog CMS, school, or CRM.

Generate the diagram

The app reads tables, columns, primary keys, unique fields, and foreign keys to place connected table cards on the canvas.

Edit and validate

Move tables, add columns, create relationships, and use validation checks to catch missing keys or broken references.

Export for your workflow

Download a PNG or PDF for sharing, JSON for projects, Mermaid for docs, or SQL when you need to recreate the schema.

Visual database canvas

Zoom, fit view, auto-layout, drag tables, and inspect relationships without leaving the browser.

Schema editing tools

Add tables, columns, primary keys, foreign keys, and relationship types after generating the first diagram.

Private local workflow

SQL parsing, autosave, template loading, and export actions happen client-side for a fast, low-friction workflow.

Why use an online ERD generator?

An entity-relationship diagram makes a database schema easier to review before implementation. Instead of reading long SQL files line by line, you can see tables, fields, primary keys, and foreign key relationships on one canvas.

Good use cases

Review a new feature schema before creating migrations.
Document database structure for a README, wiki, or architecture note.
Teach relational database concepts with editable sample schemas.
Convert an existing SQL schema into a cleaner visual model.

Supported workflow

Paste SQL CREATE TABLE statements into the app.
Generate a visual ERD with table cards and relationship lines.
Validate keys, edit fields, save local projects, and export the result.

FAQs

What is ERD Generator?

ERD Generator is a browser-based database diagram app that converts SQL CREATE TABLE statements into editable entity-relationship diagrams.

Is ERD Generator free to use?

Yes. ERD Generator is free and designed for fast browser-based database planning and documentation.

Does ERD Generator upload my SQL?

No. SQL parsing and diagram editing happen locally in your browser, so your schema text is not uploaded to a server.

What can I export from the ERD app?

You can export PNG, PDF, JSON, Mermaid, or SQL depending on whether you need an image, documentation snippet, project data, or recreated schema.