> For the complete documentation index, see [llms.txt](https://docs.htmlcsstoimg.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.htmlcsstoimg.com/html-to-image-api/authorization.md).

# Authorization

Learn how authorization for the API works

HTML/CSS to Image API works on API Key Authorization.

You can pass the API Key on the Header.

Here's an example from Postman

<figure><img src="https://3256700609-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbFO0x1WAxorjLyG1yi32%2Fuploads%2F7rAODiePzmIrbKp8XEPO%2FScreenshot%202023-10-27%20at%2011.21.59%E2%80%AFAM.png?alt=media&amp;token=6aa76bdc-3ba5-4a7b-bd68-35138dcd905d" alt=""><figcaption></figcaption></figure>