> For the complete documentation index, see [llms.txt](https://cranford-tech.gitbook.io/charles/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cranford-tech.gitbook.io/charles/key-features/capture-screenshot.md).
# Capture screenshot
Take a screenshot of the active tab’s viewport (i.e. the part that is currently visible on the screen):
1. Add the element `Charles: Screenshot` to the page.
2. Use the action `Charles: Capture Screenshot` to initiate a screenshot
3. Once the screenshot is taken, the event `screenshotCaptured` is triggered. You can use the `Charles: Screenshot`'s states
1. `Screenshot URL` to access an image uploaded to the Bubble CDN. Please use `:saved to S3` to make sure the image is permanently stored. This should be the main way of storing images.
2. `Base64 encoded image` to save a base64 encoded image directly to Bubble’s databse. This can be useful if you need to use any 3rd party APIs that expect a base64 encoded image. Please note that the string contains a prefix: `data:image/png;base64,iVBORw0KGgoAAA…`
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://cranford-tech.gitbook.io/charles/key-features/capture-screenshot.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.