Wan v2.6 Image to Image | Image to Image

wan/v2.6/image-to-image

Wan 2.6 image-to-image model.

Inference

Commercial use

Partner

Schema

LLMs

Playground API

About

Edit or generate images using 1-3 reference images.

Wan 2.6 Image Edit features:

Style transfer from reference images
Subject consistency across generated images
Multi-image input for complex compositions (1-3 images)
Generate 1-4 output images
Prompt expansion with LLM optimization

Image requirements:

Formats: JPEG, JPG, PNG (no alpha), BMP, WEBP
Resolution: 384-5000 pixels (width and height)
Max size: 10MB each

Output specifications:

Format: PNG
Resolution: Specified by size parameter or default 1280*1280
Total pixels: 768768 to 12801280
Aspect ratio: 1:4 to 4:1

Prompt tips:

Reference images as 'image 1', 'image 2', 'image 3' in your prompt
Example: 'Generate using the style of image 1 and background of image 2'

1. Calling the API#

Install the client#

The client provides a convenient way to interact with the model API.

npm install --save @fal-ai/client

Migrate to @fal-ai/client

The @fal-ai/serverless-client package has been deprecated in favor of @fal-ai/client. Please check the migration guide for more information.

Setup your API Key#

Set FAL_KEY as an environment variable in your runtime.

export FAL_KEY="YOUR_API_KEY"

Submit a request#

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("wan/v2.6/image-to-image", {
  input: {
    prompt: "Place the wizard from image 2 in the ancient library from image 3, holding and studying the magical crystal orb from image 1. The orb's glow illuminates his face with purple and blue light. Floating candles around him, ancient books visible in the background. Mystical, dramatic lighting, fantasy art style, highly detailed.",
    image_urls: ["https://v3b.fal.media/files/b/0a86d6a7/6smIczyPbvAU3IJ1F5Ok3.png", "https://v3b.fal.media/files/b/0a86d6a7/nTYVlOfKLD1FqHAGy7KS3.png", "https://v3b.fal.media/files/b/0a86d6ae/6JA70jOe0-pbDtXLF2roV.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);

2. Authentication#

The API uses an API Key for authentication. It is recommended you set the FAL_KEY environment variable in your runtime when possible.

API Key#

In case your app is running in an environment where you cannot set environment variables, you can set the API Key manually as a client configuration.

import { fal } from "@fal-ai/client";

fal.config({
  credentials: "YOUR_FAL_KEY"
});

Protect your API 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.

3. Queue#

Long-running requests

For long-running requests, such as training jobs or models with slower inference times, it is recommended to check the Queue status and rely on Webhooks instead of blocking while waiting for the result.

Submit a request#

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("wan/v2.6/image-to-image", {
  input: {
    prompt: "Place the wizard from image 2 in the ancient library from image 3, holding and studying the magical crystal orb from image 1. The orb's glow illuminates his face with purple and blue light. Floating candles around him, ancient books visible in the background. Mystical, dramatic lighting, fantasy art style, highly detailed.",
    image_urls: ["https://v3b.fal.media/files/b/0a86d6a7/6smIczyPbvAU3IJ1F5Ok3.png", "https://v3b.fal.media/files/b/0a86d6a7/nTYVlOfKLD1FqHAGy7KS3.png", "https://v3b.fal.media/files/b/0a86d6ae/6JA70jOe0-pbDtXLF2roV.png"]
  },
  webhookUrl: "https://optional.webhook.url/for/results",
});

Fetch request status#

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("wan/v2.6/image-to-image", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b",
  logs: true,
});

Get the result#

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("wan/v2.6/image-to-image", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b"
});
console.log(result.data);
console.log(result.requestId);

4. Files#

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.

Data URI (base64)#

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.

Hosted files (URL)#

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.

Uploading files#

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);

Auto uploads

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.

5. Schema#

Input#

prompt string* required

Text prompt describing the desired image. Supports Chinese and English. Max 2000 characters. Example: 'Generate an image using the style of image 1 and background of image 2'.

image_urls list<string>* required

Reference images for editing (1-3 images required). Order matters: reference as 'image 1', 'image 2', 'image 3' in prompt. Resolution: 384-5000px each dimension. Max size: 10MB each. Formats: JPEG, JPG, PNG (no alpha), BMP, WEBP.

negative_prompt string

Content to avoid in the generated image. Max 500 characters. Default value: ""

image_size ImageSize | Enum

Output image size. Use presets like 'square_hd', 'landscape_16_9', 'portrait_9_16', or specify exact dimensions with ImageSize(width=1280, height=720). Total pixels must be between 768768 and 12801280. Default value: square_hd

Possible enum values: square_hd, square, portrait_4_3, portrait_16_9, landscape_4_3, landscape_16_9

Note: For custom image sizes, you can pass the width and height as an object:

"image_size": {
  "width": 1280,
  "height": 720
}

num_images integer

Number of images to generate (1-4). Directly affects billing cost. Default value: 1

enable_prompt_expansion boolean

Enable LLM prompt optimization. Significantly improves results for simple prompts but adds 3-4 seconds processing time. Default value: true

seed integer

Random seed for reproducibility (0-2147483647). Same seed produces more consistent results.

enable_safety_checker boolean

Enable content moderation for input and output. Default value: true

{
  "prompt": "Place the wizard from image 2 in the ancient library from image 3, holding and studying the magical crystal orb from image 1. The orb's glow illuminates his face with purple and blue light. Floating candles around him, ancient books visible in the background. Mystical, dramatic lighting, fantasy art style, highly detailed.",
  "image_urls": [
    "https://v3b.fal.media/files/b/0a86d6a7/6smIczyPbvAU3IJ1F5Ok3.png",
    "https://v3b.fal.media/files/b/0a86d6a7/nTYVlOfKLD1FqHAGy7KS3.png",
    "https://v3b.fal.media/files/b/0a86d6ae/6JA70jOe0-pbDtXLF2roV.png"
  ],
  "negative_prompt": "low resolution, error, worst quality, low quality, deformed, extra fingers",
  "image_size": "square_hd",
  "num_images": 1,
  "enable_prompt_expansion": true,
  "enable_safety_checker": true
}

Output#

images list<File>* required

Generated images in PNG format

seed integer* required

The seed used for generation

{
  "images": [
    {
      "file_name": "output_1.png",
      "content_type": "image/png",
      "url": "https://v3b.fal.media/files/b/0a86d6bb/iSEuXzi3kDy1jnlMCwYuH_output_3.png"
    }
  ],
  "seed": 175932751
}

Other types#

VideoFile#

url string* required

The URL where the file can be downloaded from.

content_type string

The mime type of the file.

file_name string

The name of the file. It will be auto-generated if not provided.

file_size integer

The size of the file in bytes.

file_data string

File data

width integer

The width of the video

height integer

The height of the video

fps float

The FPS of the video

duration float

The duration of the video

num_frames integer

The number of frames in the video

ImageSize#

width integer

The width of the generated image. Default value: 512

height integer

The height of the generated image. Default value: 512

File#

url string* required

The URL where the file can be downloaded from.

content_type string

The mime type of the file.

file_name string

The name of the file. It will be auto-generated if not provided.

file_size integer

The size of the file in bytes.

file_data string

File data

Table of contents

1. Calling the API

2. Authentication

3. Queue

4. Files

5. Schema

About

1. Calling the API#

Install the client#

Migrate to @fal-ai/client

Setup your API Key#

Submit a request#

2. Authentication#

API Key#

Protect your API Key

3. Queue#

Long-running requests

Submit a request#

Fetch request status#

Get the result#

4. Files#

Data URI (base64)#

Hosted files (URL)#

Uploading files#

Auto uploads

5. Schema#

Input#

Output#

Other types#

VideoFile#

ImageSize#

File#

Related Models

Wan v2.6 Image to Image Image to Image

Table of contents

1. Calling the API

2. Authentication

3. Queue

4. Files

5. Schema

About

1. Calling the API#

Install the client#

Migrate to @fal-ai/client

Setup your API Key#

Submit a request#

2. Authentication#

API Key#

Protect your API Key

3. Queue#

Long-running requests

Submit a request#

Fetch request status#

Get the result#

4. Files#

Data URI (base64)#

Hosted files (URL)#

Uploading files#

Auto uploads

5. Schema#

Input#

Output#

Other types#

VideoFile#

ImageSize#

File#

Related Models