> For the complete documentation index, see [llms.txt](https://boxlang.ortusbooks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://boxlang.ortusbooks.com/boxlang-framework/modularity/image-manipulation/reference/built-in-functions/isimagefile.md).

# IsImageFile

## Syntax

```
IsImageFile( value )
```

## Arguments

| Name  | Type | Required | Description                                           |
| ----- | ---- | -------- | ----------------------------------------------------- |
| value | any  | Yes      | The file path or URL to check if it is an image file. |

## Returns

`Boolean` — Returns `true` if the value is a valid image file or URL, otherwise `false`.

## Description

Determines whether the provided value is a valid image file or image URL. Useful for validating file paths or URLs before attempting to read or process images.

## Example

```boxlang
// Check if a file is an image
if ( IsImageFile( "images/photo.png" ) ) {
    img = ImageRead( "images/photo.png" );
}

// Check if a URL is an image
if ( IsImageFile( "https://example.com/image.jpg" ) ) {
    img = ImageRead( "https://example.com/image.jpg" );
}
```

## Related BIFs

* IsImage
* ImageRead
* ImageNew

## Notes

* Returns `true` for valid image files or URLs that can be read as images.
* Returns `false` if the file or URL is not a valid image or cannot be read.
* Use this BIF to validate paths before calling image-related functions.
* Supports all registered ImageIO formats including PNG, JPEG, WebP, GIF, BMP, and TIFF. WebP reading works cross-platform (including macOS ARM64) via the bundled TwelveMonkeys ImageIO plugin.


---

# 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 by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://boxlang.ortusbooks.com/boxlang-framework/modularity/image-manipulation/reference/built-in-functions/isimagefile.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

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.