About SQL to ER Diagram
Free online SQL to ER diagram tool. Automatically parse SQL DDL CREATE TABLE statements and generate entity-relationship diagrams. Supports primary/foreign key detection and SVG/PNG export.
SQL ToolER DiagramDatabase Design
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User Guide
Key Features
- Free online SQL to ER diagram tool — works right in your browser, no installation needed
- Automatically parses SQL DDL CREATE TABLE statements, detects primary keys, foreign keys, and unique constraints, and generates entity-relationship diagrams in real time
- Supports zoom, fullscreen preview, one-click copy of the Mermaid source, and SVG/PNG export
How to Use
- Open the tool page — no download or installation required
- Paste your SQL CREATE TABLE statements into the input box on the left, or pick a preset example from the "Examples" dropdown to try it out
- The ER diagram is parsed and rendered in real time as you type — use "Zoom In/Zoom Out" to adjust the view, or click "Fullscreen" to enlarge it
- Click "Download" to export the diagram as SVG or PNG; the "Mermaid Source" section below supports one-click "Copy"
Important Notes
- This tool is completely free and requires no registration or login
- All parsing and rendering happens locally in your browser — your data is never uploaded
- It supports standard CREATE TABLE statements; complex statements such as stored procedures or views are not parsed, so please use standard syntax
Frequently Asked Questions
What is SQL to ER Diagram?
Free online SQL to ER diagram tool. Automatically parse SQL DDL CREATE TABLE statements and generate entity-relationship diagrams. Supports primary/foreign key detection and SVG/PNG export.
How do I use SQL to ER Diagram?
Open the tool page — no download or installation required Paste your SQL CREATE TABLE statements into the input box on the left, or pick a preset example from the "Examples" dropdown to try it out The ER diagram is parsed and rendered in real time as you type — use "Zoom In/Zoom Out" to adjust the view, or click "Fullscreen" to enlarge it Click "Download" to export the diagram as SVG or PNG; the "Mermaid Source" section below supports one-click "Copy"
What should I know before using SQL to ER Diagram?
This tool is completely free and requires no registration or login All parsing and rendering happens locally in your browser — your data is never uploaded It supports standard CREATE TABLE statements; complex statements such as stored procedures or views are not parsed, so please use standard syntax
Is SQL to ER Diagram free to use?
Yes, SQL to ER Diagram is completely free. No download or installation required — it runs right in your browser.