> ## Documentation Index
> Fetch the complete documentation index at: https://docs.toapis.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Gemini-3-Pro Image Generation

> Generate images using Google Gemini 3 Pro model, with powerful image generation capabilities

> [!NOTE]
>
> **Note for users in mainland China:** Please use `https://toapis.cn` as the API endpoint (Base URL). Replace `https://toapis.com` with `https://toapis.cn` in the examples in this document.

* Google Gemini 3 Pro powerful image generation model (Nano banana2)
* Use model parameter to select `gemini-3-pro-image-preview` model
* Supports text-to-image generation
* Async task management, query results by task ID

> [!WARNING]
>
> **Important Change**: For better performance and cost control, we no longer support passing base64 image data directly in `image_urls`. Please use the [Upload Image API](https://docs.toapis.com/docs/en/api-reference/uploads/images.md) first to upload images and get URLs, then call this endpoint.

## Authorizations

**Authorization** `string` *required*

All endpoints require Bearer Token authentication

Get your API Key from the [API Key Management Page](https://toapis.com/console/token)

Add to request header:

```
Authorization: Bearer YOUR_API_KEY
```

## Body

**model** `string` *required* (default: gemini-3-pro-image-preview)

Image generation model name

Model alias: `nano-banana-pro`

Example: `"gemini-3-pro-image-preview"`

**prompt** `string` *required*

Text description for image generation

The upstream model input limit is 65,536 tokens. ToAPIs does not add a 1000-character cap.

**size** `string`

Image generation aspect ratio

Supported formats:

* Ratios: `1:1`, `2:3`, `3:2`, `3:4`, `4:3`, `4:5`, `5:4`, `9:16`, `16:9`, `21:9`

**n** `integer` (default: 1)

Number of images to generate

Fixed at 1

**⚠️ Note:** Must be a pure number (e.g. `1`), do not add quotes, otherwise it will error

**metadata** `object`

Metadata parameters for passing additional configuration options

**Supported metadata fields**

**resolution** `string` (default: 1K)

Output image resolution

Supported values:

* `1K` - 1K resolution (default)
* `2K` - 2K resolution
* `4K` - 4K resolution

**orientation** `string`

Image orientation

Supported values:

* `landscape` - Landscape
* `portrait` - Portrait

**image\_urls** `object[]`

List of reference image URLs for image-to-image or image editing

**Detailed field description**

**url** `string` *required*

Image URL address

**⚠️ URL format only (base64 no longer supported)**

* Publicly accessible image URL (http\:// or https\://)
* Example: `https://example.com/image.jpg`
* You can use the [Upload Image API](https://docs.toapis.com/docs/en/api-reference/uploads/images.md) to upload local images and get URLs

**Limitations:**

* Single image must not exceed 10MB
* Supported formats: .jpeg, .jpg, .png, .webp

**Limit:** Maximum 6 images

## Response

**id** `string`

Unique task identifier for status queries

**object** `string`

Object type, always `generation.task`

**model** `string`

Model name used

**status** `string`

Task status

* `queued` - Queued for processing
* `in_progress` - Processing
* `completed` - Successfully completed
* `failed` - Failed

**progress** `integer`

Task progress percentage (0-100)

**created\_at** `integer`

Task creation timestamp (Unix timestamp)

**metadata** `object`

Task metadata

```bash cURL theme={null}
curl --request POST \
  --url https://toapis.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gemini-3-pro-image-preview",
    "prompt": "Futuristic city skyline with neon lights",
    "size": "16:9",
    "n": 1,
    "metadata": {
      "resolution": "1K",
      "orientation": "landscape"
    }
  }'
```

```bash cURL (Image-to-Image) theme={null}
curl --request POST \
  --url https://toapis.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gemini-3-pro-image-preview",
    "prompt": "Enhance the colors and details of this city photo",
    "size": "16:9",
    "n": 1,
    "metadata": {
      "resolution": "2K"
    },
    "image_urls": ["https://example.com/city.jpg"]
  }'
```

```python Python theme={null}
import requests

response = requests.post(
    "https://toapis.com/v1/images/generations",
    headers={
        "Authorization": "Bearer your-ToAPIs-key",
        "Content-Type": "application/json"
    },
    json={
        "model": "gemini-3-pro-image-preview",
        "prompt": "Futuristic city skyline with neon lights",
        "size": "16:9",
        "n": 1,
        "metadata": {
            "resolution": "1K",
            "orientation": "landscape"
        }
    }
)

task = response.json()
print(f"Task ID: {task['id']}")
print(f"Status: {task['status']}")
```

```python Python (Image-to-Image) theme={null}
import requests

response = requests.post(
    "https://toapis.com/v1/images/generations",
    headers={
        "Authorization": "Bearer your-ToAPIs-key",
        "Content-Type": "application/json"
    },
    json={
        "model": "gemini-3-pro-image-preview",
        "prompt": "Enhance the colors and details of this city photo",
        "size": "16:9",
        "n": 1,
        "metadata": {
            "resolution": "2K"
        },
        "image_urls": ["https://example.com/city.jpg"]
    }
)

task = response.json()
print(f"Task ID: {task['id']}")
print(f"Status: {task['status']}")
```

```javascript JavaScript theme={null}
const response = await fetch('https://toapis.com/v1/images/generations', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer your-ToAPIs-key',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model: 'gemini-3-pro-image-preview',
    prompt: 'Futuristic city skyline with neon lights',
    size: '16:9',
    n: 1,
    metadata: {
      resolution: '1K',
      orientation: 'landscape'
    }
  })
});

const task = await response.json();
console.log(`Task ID: ${task.id}`);
console.log(`Status: ${task.status}`);
```

```javascript JavaScript (Image-to-Image) theme={null}
const response = await fetch('https://toapis.com/v1/images/generations', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer your-ToAPIs-key',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model: 'gemini-3-pro-image-preview',
    prompt: 'Enhance the colors and details of this city photo',
    size: '16:9',
    n: 1,
    metadata: {
      resolution: '2K'
    },
    image_urls: ['https://example.com/city.jpg']
  })
});

const task = await response.json();
console.log(`Task ID: ${task.id}`);
console.log(`Status: ${task.status}`);
```

```json 200 theme={null}
{
  "id": "task_img_abc123def456",
  "object": "generation.task",
  "model": "gemini-3-pro-image-preview",
  "status": "queued",
  "progress": 0,
  "created_at": 1703884800,
  "metadata": {}
}
```


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