> For the complete documentation index, see [llms.txt](https://docs.jakarto.com/guide-data-downloader/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.jakarto.com/guide-data-downloader/en/frequently-asked-questions-faq/file-formats-and-compatibility-explanation.md).

# File Formats and Compatibility Explanation

The files are provided in **COPC (Cloud Optimized Point Cloud)** format, an optimized extension of the **LAZ** format. This **compressed and structured** format allows for faster data access, especially for web dissemination use cases (such as [Jakartowns](https://docs.jakarto.com/guide-jakartowns/fr/jakartowns/raccourcis-clavier/general)), while remaining **compatible** with software that supports the LAZ format.

When a transformation is requested (change of horizontal/vertical CRS), the output is provided in **LAS** (uncompressed). If you explicitly choose the **LAS** format in the tool, the output will also be LAS. If you prefer **LAZ** and no transformation is needed, the tool delivers the **native COPC (.laz)**.