Privacy Policy

Last updated: September 2, 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.

Google explains how it processes information from sites that use its services in How Google uses information from sites or apps that use our services.

Cookies

Free ER Diagram does not require account cookies. Third parties, including Google, may place and read cookies in your browser or use web beacons, IP addresses, and similar identifiers to measure traffic, prevent fraud, select ads, and measure ad performance. You can manage advertising personalization in Google Ads Settings.

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. Where consent is required, advertising and analytics storage should remain restricted until the visitor makes a choice through the consent interface.

Choices And Data Controls

Visitors can block or delete cookies through browser settings. Visitors in regions covered by consent requirements can use the site's consent controls to accept, reject, or manage eligible advertising purposes. Disabling cookies may reduce personalization but does not prevent access to the core diagram tool.

Contact

For privacy questions, email joeshanhai@gmail.com.