> For the complete documentation index, see [llms.txt](https://xlswriter-docs.viest.me/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xlswriter-docs.viest.me/english/helper.md).

# Helper

Utility functions exposed by the extension:

* [Column index transform](/english/helper/column-index-number-string-transform.md) — convert between numeric column index and Excel-style letters (e.g. `27 ↔ AA`).
* [Get version](/english/helper/get_version.md) — return the installed extension version.
* [Get author](/english/helper/get_author.md) — return author / contact information.