KronoBase is a collaborative history project operated by the KronoBase Association, a French nonprofit association established in 2006. Its aim is to build a universal, multilingual chronology covering the history of the world. The site organizes factual, date-based events into timelines that can be explored by historical period, date, or theme, with entries presented down to individual days.

It also offers chronological biographies and genealogies, alongside themed histories of places, people, institutions, and subjects such as cinema, music, automobiles, wars, and travel. Visitors can browse featured chronologies, search and explore a thematic index, or contribute new material. Contributions are reviewed by a committee of historians, reflecting the project’s stated commitment to verification.

The site reports a collection of more than 229,000 events and provides resources including a forum, FAQ, tutorial, statistics, and contact options. KronoBase makes its texts available under the GNU Free Documentation License. Through its reference tools and community contributions, the project helps users discover historical events and follow connections across periods and topics