> 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/getwriteableimageformats.md). # GetWriteableImageFormats Returns an array of writeable image formats supported by the underlying Java ImageIO library. This BIF is useful for determining which image formats can be written (exported) in BoxLang on the current platform. ## Syntax ``` GetWriteableImageFormats() ``` ## Arguments This BIF does not accept any arguments. ## Returns * **Array**: An array of strings, each representing a writeable image format name (e.g., "png", "jpg", "gif"). ## Description `GetWriteableImageFormats` queries the Java ImageIO subsystem for all image formats that can be written (encoded) in the current environment. The returned array contains the format names as strings. This is useful for dynamically checking which image types are supported for writing, especially in environments where available formats may vary. ## Example ```boxlang formats = GetWriteableImageFormats(); // formats might be ["BMP", "GIF", "JPEG", "PNG", "TIFF", "WEBP"] ``` ## See Also * GetReadableImageFormats * ImageWrite * ImageWriteBase64 ## Notes * The list of formats depends on the Java runtime and any installed ImageIO plugins. * BoxLang's `ImageWrite` auto-detects the output format from the file extension and writes to any registered ImageIO format. * Common writable formats include "png", "jpg", "gif", "webp", "bmp", "tiff", but may include others depending on the environment. * Images with alpha channels written to formats without transparency support (JPEG, BMP) are automatically composited onto a white background. --- # 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/getwriteableimageformats.md?ask=&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.