Expand an image beyond its borders using BFL FLUX Outpainting.
Provide a reference image plus per-side expansion amounts; FLUX Outpainting paints a coherent scene extension at the model level so the new pixels match the existing content without seams or texture drift.
The client provides a convenient way to interact with the model API.
npm install --save @fal-ai/clientThe @fal-ai/serverless-client package has been deprecated in favor of @fal-ai/client. Install the new package and update your imports — see client setup.
Set FAL_KEY as an environment variable in your runtime.
export FAL_KEY="YOUR_API_KEY"The client API handles the API submit protocol. It will handle the request status updates and return the result when the request is completed.
import { fal } from "@fal-ai/client";
const result = await fal.subscribe("fal-ai/flux-2-pro/outpaint", {
input: {
image_url: "https://v3b.fal.media/files/b/0a9a3ba3/s-Z4TGRh9EQwXWTWrvzaB_Nbqhm4Fl.png"
},
logs: true,
onQueueUpdate: (update) => {
if (update.status === "IN_PROGRESS") {
update.logs.map((log) => log.message).forEach(console.log);
}
},
});
console.log(result.data);
console.log(result.requestId);The API uses an API Key for authentication. It is recommended you set the FAL_KEY environment variable in your runtime when possible.
import { fal } from "@fal-ai/client";
fal.config({
credentials: "YOUR_FAL_KEY"
});When running code on the client-side (e.g. in a browser, mobile app or GUI applications), make sure to not expose your FAL_KEY. Instead, use a server-side proxy to make requests to the API. For more information, check out our server-side integration guide.
The client API provides a convenient way to submit requests to the model.
import { fal } from "@fal-ai/client";
const { request_id } = await fal.queue.submit("fal-ai/flux-2-pro/outpaint", {
input: {
image_url: "https://v3b.fal.media/files/b/0a9a3ba3/s-Z4TGRh9EQwXWTWrvzaB_Nbqhm4Fl.png"
},
webhookUrl: "https://optional.webhook.url/for/results",
});You can fetch the status of a request to check if it is completed or still in progress.
import { fal } from "@fal-ai/client";
const status = await fal.queue.status("fal-ai/flux-2-pro/outpaint", {
requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b",
logs: true,
});Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.
import { fal } from "@fal-ai/client";
const result = await fal.queue.result("fal-ai/flux-2-pro/outpaint", {
requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b"
});
console.log(result.data);
console.log(result.requestId);Some attributes in the API accept file URLs as input. Whenever that's the case you can pass your own URL or a Base64 data URI.
You can pass a Base64 data URI as a file input. The API will handle the file decoding for you. Keep in mind that for large files, this alternative although convenient can impact the request performance.
You can also pass your own URLs as long as they are publicly accessible. Be aware that some hosts might block cross-site requests, rate-limit, or consider the request as a bot.
We provide a convenient file storage that allows you to upload files and use them in your requests. You can upload files using the client API and use the returned URL in your requests.
import { fal } from "@fal-ai/client";
const file = new File(["Hello, World!"], "hello.txt", { type: "text/plain" });
const url = await fal.storage.upload(file);The client will auto-upload the file for you if you pass a binary object (e.g. File, Data).
Read more about file handling in our file upload guide.
image_url string* requiredThe image URL to expand using outpainting.
expand_top integerPixels to expand at the top of the image.
expand_bottom integerPixels to expand at the bottom of the image.
expand_left integerPixels to expand on the left of the image.
expand_right integerPixels to expand on the right of the image.
auto_crop booleanWhether to automatically crop the reference image when the expanded canvas does not fully contain it.
mode ModeEnumQuality/speed trade-off for outpainting. high (default) delivers the highest-fidelity results; fast is significantly faster and extends most scenes well but may produce lower fidelity. Default value: "high"
Possible enum values: high, fast
enable_safety_checker booleanWhether to enable the safety checker. Disabling it requires account authorization; unauthorized requests are always checked. Default value: true
output_format OutputFormatEnumThe format of the generated image. Default value: "jpeg"
Possible enum values: jpeg, png
sync_mode booleanIf True, the media will be returned as a data URI and the output data won't be available in the request history.
{
"image_url": "https://v3b.fal.media/files/b/0a9a3ba3/s-Z4TGRh9EQwXWTWrvzaB_Nbqhm4Fl.png",
"expand_top": 0,
"expand_bottom": 200,
"expand_left": 200,
"expand_right": 200,
"mode": "high",
"enable_safety_checker": true,
"output_format": "jpeg"
}The outpainted images.
{
"images": [
{
"url": "https://v3b.fal.media/files/b/0a9a3c6d/csgZL8-uzDQz2DIIzKVNZ_HJX1XzZU.jpg"
}
]
}url string* requiredThe URL where the file can be downloaded from.
content_type stringThe mime type of the file.
file_name stringThe name of the file. It will be auto-generated if not provided.
file_size integerThe size of the file in bytes.
width integerThe width of the image
height integerThe height of the image