HeidiSQL is a completely free, lightweight database client for Windows supporting MariaDB, MySQL, Microsoft SQL Server, PostgreSQL, and SQLite. The tool focuses on simplicity and performance with a small footprint and fast startup. Core features include tabbed query windows, table data editing, user management, scheduled backups via command-line exports, and SSH tunnel support. No AI features are included—the tool provides straightforward database access without modern augmentation. The portable version runs without installation, useful for USB deployment or restricted environments. While Windows-only limits cross-platform teams, the zero-cost, no-registration approach makes it accessible for individual developers and students. Particularly popular in the MariaDB community due to early comprehensive support. Page should cover: supported databases and features matrix, SSH tunnel configuration, portable deployment guide, comparison with DBeaver Community, limitations (Windows-only, no AI), and use cases for students and individual developers.