Standard DDL syntax including CREATE TABLE with primary keys, foreign keys, indexes, and common data types (INT, VARCHAR, DATETIME, BOOLEAN, DECIMAL, JSON, etc.). Compatible with MySQL, PostgreSQL, and SQL Server dialects.
No. Everything runs in your browser. Your SQL never leaves your device. No server uploads, no storage, no tracking. Refresh the page and your data is immediately gone.
Yes. Download as PNG, SVG, or PDF using the export button. Works at any zoom level and preserves diagram quality in all formats.
Check for common issues: missing commas between columns, unsupported data types, or malformed constraints. The tool shows detailed error messages to help debug syntax issues.
Foreign key constraints become visual connections between tables showing cardinality (one-to-many, many-to-many, etc.) and the direction of the relationship.
Any modern browser with JavaScript: Chrome, Firefox, Safari, Edge. Works on desktop and mobile. No plugins or extensions required.
Yes. Since everything runs client-side, save the page locally or bookmark it for offline access. Just load once, then use without internet.
Most schemas work fine. Browser memory typically allows several MB of SQL. Very large schemas (50+ tables) may slow rendering slightly.