# H2 Database Engine Welcome to H2, the Java SQL database. The main features of H2 are: Very fast, open source, JDBC API Embedded and server modes; in-memory databases Browser based Console application Small footprint: around 2 MB jar file size
## Download Version ${version} (${versionDate})
| Windows Installer (5 MB)
| All Platforms (zip, 8 MB)
All Downloads
## Support Stack Overflow (tag H2) Google Group English, Japanese For non-technical issues, use:
## Features
| H2 | Derby | HSQLDB | MySQL | PostgreSQL
--- | --- | --- | --- | --- | ---
Pure Java | Yes | Yes | Yes | No | No
Memory Mode | Yes | Yes | Yes | No | No
Encrypted Database | Yes | Yes | Yes | No | No
ODBC Driver | Yes | No | No | Yes | Yes
Fulltext Search | Yes | No | No | Yes | Yes
Multi Version Concurrency | Yes | No | Yes | Yes | Yes
Footprint (embedded) | ~2 MB | ~3 MB | ~1.5 MB | — | —
Footprint (client) | ~500 KB | ~600 KB | ~1.5 MB | ~1 MB | ~700 KB
See also the detailed comparison.
## News Newsfeeds: Full text (Atom) or Header only (RSS). Email Newsletter: Subscribe to H2 Database News (Google account required) to get informed about new releases. Your email address is only used in this context.
## Contribute You can contribute to the development of H2 by sending feedback and bug reports, or translate the H2 Console application (for details, start the H2 Console and select Options / Translate). To donate money, click on the PayPal button below. You will be listed as a supporter: