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layout: documentation
title: Transformations
---

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# Transformation Definition (File-based)

Transformation definitons are needed to translate between (possibly technical) item states and human readable representations.
For further details, please check:

* [The openHAB 1.x wiki transformations article](https://github.com/openhab/openhab/wiki/Transformations)
* [Usage during items definition]({{base}}/configuration/items.html#transforming)
* [Usage during sitemap definition]({{base}}/configuration/sitemaps.html#element-type-text)

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