> For the complete documentation index, see [llms.txt](https://help.vectary.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.vectary.com/documentation/sharing-exporting-embedding/optimizing-a-shared-project/hdri.md).
# HDRI
HDRI maps are a powerful way to light scenes and add realistic reflections. Every project in Vectary comes with a default [HDRI environment](/documentation/design-process/environment.md) that provides basic lighting by default. You can choose from a range of HDRI maps available in the [built-in library](/documentation/design-process/libraries/environments-library.md) via the Environment settings, or import a custom HDRI file. However, keep in mind that HDRI maps can dramatically increase project size — especially when imported in high resolution.
#### Tips & recommendations
* **Check file size before importing** – HDRI files, particularly custom ones, can be very large. Always verify the file size and consider optimizing before upload.
* **Reduce resolution if possible** – HDRI resolution has a direct impact on its file size. If your scene doesn’t rely on fine background detail, consider using a lower resolution HDRI to reduce load times.\
HDRI resolution can be adjusted directly in Studio — in the Environment settings.\
\
* **Use compression** – when exporting or preparing HDRI files, consider using **DWAA** or **DWAB** compression. These methods can significantly reduce file size without major visual loss.
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