SQL to ER Diagram — free online ERD generator: convert a SQL schema (CREATE TABLE statements) into an interactive entity-relationship diagram in your browser. Turn SQL into a diagram instantly, no signup.

SQL to ER Diagram
SQL schema

Paste SQL, see the schema.

Drop your CREATE TABLE statements on the left. Drag tables, scroll to zoom, double-click to rename, export when done.

100% local — your schema never leaves your browser. No accounts, no uploads.

SQL to ER Diagram — free online ERD generator

SQL to ER Diagram is a free, open-source tool that converts a SQL schema into an interactive entity-relationship diagram (ERD) right in your browser. Paste your CREATE TABLE statements and instantly visualize tables, columns, primary keys, foreign keys and relationships. Works with PostgreSQL, MySQL, SQLite and SQL Server. Drag tables, auto-arrange the layout, add notes, and export to PNG or SVG. Nothing is uploaded — your schema stays on your machine.

Frequently asked questions

How do I create an ER diagram from SQL?

Paste your SQL CREATE TABLE statements into the editor and SQL to ER Diagram instantly renders an interactive entity-relationship diagram. Drag tables to arrange them, then export as PNG or SVG.

Which SQL dialects are supported?

It parses standard CREATE TABLE and ALTER TABLE DDL and works with PostgreSQL, MySQL, SQLite and SQL Server syntax, including primary keys, foreign keys, unique and not-null constraints.

Is it free?

Yes. SQL to ER Diagram is completely free and open source, with no account or sign-up required.

Is my data private? Does my SQL get uploaded?

Everything runs locally in your browser. Your SQL schema is never uploaded to or stored on any server.

Can I export the diagram?

Yes. You can export a high-resolution PNG or a vector SVG, save the full project as a file, or copy a shareable link that encodes the diagram in the URL.

Do I need to install anything?

No installation needed. It runs entirely in your web browser on both desktop and mobile.