ERD Diagram Converter

Transform your database schema between multiple formats seamlessly. Import SQL DDL statements, Mermaid ERD syntax, PlantUML code, or JSON schema definitions. Visualize relationships and cardinality with an interactive diagram, edit entities and constraints, then export to SVG, PNG, Mermaid, PlantUML, SQL, or JSON formats. Perfect for database architects and data engineers.

Multi-Format Import Interactive Visualization Drag & Drop Relationship Management Multiple Export Formats

Quick Examples

SQL: CREATE TABLE users (id INT PRIMARY KEY, name VARCHAR(100))
MERMAID: erDiagram USERS ||--o{ ORDERS : places
JSON: Tables and columns schema

Input Format

Upload File

SQL, JSON, TXT

Settings

Layout

Show Data Types

Statistics

Tables

Relations

Entity-Relationship Diagram

Paste schema data and click Convert

Legend

Cardinality:

—— = One to One
—◯ = One to Many
◯—◯ = Many to Many

Column Types:

Column = Primary Key
◉ Column = Foreign Key
* Column = NOT NULL

Export

Controls

Wheel to zoom, drag to pan

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

What input formats does the ERD Converter support?

The tool supports SQL DDL (CREATE TABLE statements), Mermaid ERD syntax, PlantUML code, and JSON schema definitions. Simply paste or upload your schema in any of these formats.

How do I use the ERD Diagram Converter?

Paste your SQL CREATE TABLE statements, Mermaid diagram code, or other schema format into the input panel. The tool automatically visualizes relationships and entities. You can then edit, adjust layout, and export in your preferred format.

What export formats are available?

Export your diagrams as SVG (vector), PNG/JPG (raster), Mermaid markdown, PlantUML source code, SQL DDL statements, or JSON schema. Each format is optimized for different use cases.

Does this work on mobile devices?

Yes, the diagram converter works on all modern browsers including mobile devices. The interface is fully responsive and all functionality runs client-side without server uploads.

What are the limitations?

The tool handles most standard SQL dialects. Very complex schemas (1000+ tables) may experience performance impacts. All processing happens locally in your browser for privacy and security.