Privacy Policy

Last updated: July 14, 2026

Free ER Diagram is a browser-based SQL DDL to ER diagram generator. This page explains what data is processed, what is stored locally, and which third-party services may be used.

Data Processing

SQL statements, table definitions, relationships, diagram settings, and generated diagram code are processed in your browser. We do not operate an application database that stores your SQL input or generated diagrams.

Local Storage

The tool can save history, settings, and backups in your browser localStorage so you can continue working later. This data remains on your device unless you export it, share it, or clear browser storage.

Third-Party Services

The site may use Google Analytics for aggregate traffic measurement and Google AdSense for advertising after approval. PlantUML rendering may use the public PlantUML service when you choose PlantUML output. Mermaid diagrams are rendered locally in the browser.

Cookies

Free ER Diagram does not require account cookies. Google services may use cookies or similar technologies for analytics, security, fraud prevention, and advertising according to Google's own policies.

Advertising

If ads are displayed, they are served by Google AdSense. Google may personalize or measure ads based on user settings, region, consent requirements, and applicable law.

Contact

For privacy questions, email joeshanhai@gmail.com.