> ## Documentation Index
> Fetch the complete documentation index at: https://docs.openinary.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# How Transformations Work

> URL structure for on-the-fly image and video transformations, caching behavior, and cache invalidation with Openinary.

Transformations are applied by embedding parameters directly in the URL. The first request triggers processing; subsequent requests are served from cache in under 50ms.

For the full endpoint reference — URL structure, all parameters, and response details — see the [Transform Media API reference](/api-reference/media/transform).

## Explore transformations

<CardGroup cols={2}>
  <Card title="Image Transformations" icon="image" href="/media-transformations/image-transformations">
    Resize, crop, rotate, and convert images — with face detection and smart format selection.
  </Card>

  <Card title="Video Transformations" icon="video" href="/media-transformations/video-transformations">
    Resize, trim, extract frames, and re-encode videos with quality control.
  </Card>

  <Card title="Upload & Prewarm" icon="upload" href="/media-transformations/upload-and-prewarm">
    Upload files and pre-generate transformed variants so the first public request is already cached.
  </Card>

  <Card title="Signed URLs" icon="lock" href="/media-transformations/signed-urls">
    Restrict transformations to those explicitly authorized by your backend.
  </Card>
</CardGroup>