Pixazo API→Image Tools API→Image Extender

Image Extender API - AI Expand, Outpaint & Uncrop Photos: Pricing, Documentation

Image Extender API call. Expand directionally with expand_left, expand_right, expand_top and expand_bottom (0-700 pixels each), or uniformly with zoom_out_percentage (default 20). An optional prompt guides what the model fills into the new area — continuing sky, landscape, background or subject rather than mirroring or stretching pixels. Output arrives as PNG (default), JPEG, JPG or WEBP with the original detail, lighting and composition preserved and the extended area seamlessly matched to it.

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Image Extender 1.0 API Documentation

https://gateway.pixazo.ai/image-outpaint/v1

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Image Outpaint generate request

Request Code

POST https://gateway.pixazo.ai/image-outpaint/v1/image-outpaint-request
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_API_KEY

{
  "image_url": "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/doc-assets/images/input.jpg",
  "zoom_out_percentage": 20,
  "num_images": 1,
  "enable_safety_checker": true,
  "output_format": "png"
}

import requests

url = "https://gateway.pixazo.ai/image-outpaint/v1/image-outpaint-request"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_API_KEY"
}
data = {
    "image_url": "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/doc-assets/images/input.jpg",
    "zoom_out_percentage": 20,
    "num_images": 1,
    "enable_safety_checker": true,
    "output_format": "png"
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = "https://gateway.pixazo.ai/image-outpaint/v1/image-outpaint-request";
const headers = {
  "Content-Type": "application/json",
  "Cache-Control": "no-cache",
  "Ocp-Apim-Subscription-Key": "YOUR_API_KEY"
};
const data = {
  "image_url": "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/doc-assets/images/input.jpg",
  "zoom_out_percentage": 20,
  "num_images": 1,
  "enable_safety_checker": true,
  "output_format": "png"
};

fetch(url, {
  method: "POST",
  headers: headers,
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data));

curl -X POST "https://gateway.pixazo.ai/image-outpaint/v1/image-outpaint-request" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  --data-raw '{
    "image_url": "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/doc-assets/images/input.jpg",
    "zoom_out_percentage": 20,
    "num_images": 1,
    "enable_safety_checker": true,
    "output_format": "png"
  }'

Output

{
  "request_id": "image-outpaint_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/image-outpaint_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

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Webhook (Optional)

Add the X-Webhook-URL header to your generate request to receive a POST callback instead of polling.

X-Webhook-URL: https://your-server.com/webhook/callback

Request Parameters - Image Outpaint generate request

Parameter	Required	Type	Default	Allowed values / range	Description
image_url	Yes	string	—	—	URL of the input image to outpaint. Must be publicly accessible.
expand_left	No	integer	0	0–700	Number of pixels to add as a black margin on the left side before outpainting.
expand_right	No	integer	0	0–700	Number of pixels to add as a black margin on the right side before outpainting.
expand_top	No	integer	0	0–700	Number of pixels to add as a black margin on the top side before outpainting.
expand_bottom	No	integer	0	0–700	Number of pixels to add as a black margin on the bottom side before outpainting.
zoom_out_percentage	No	float	20	≥ 0	Percentage to scale down the image (e.g., 50 = image becomes 50% of original size). Black margins fill the remaining space.
prompt	No	string	""	—	Optional text prompt to guide content generation in the expanded areas (e.g., "a forest extending to the left").
seed	No	integer	—	—	Random seed for reproducible results. If omitted, a random seed is used.
num_images	No	integer	1	≥ 1	Number of output images to generate.
enable_safety_checker	No	boolean	true	—	Enable or disable the NSFW content safety filter.
sync_mode	No	boolean	false	—	If true, the request blocks until generation is complete. If false (default), returns immediately with a request_id.
output_format	No	string	"png"	"png", "jpeg", "jpg", "webp"	Output image format.

Example Request

{
  "image_url": "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/doc-assets/images/input.jpg",
  "zoom_out_percentage": 20,
  "num_images": 1,
  "enable_safety_checker": true,
  "output_format": "png"
}

Response

{
  "request_id": "image-outpaint_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/image-outpaint_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_API_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'image-outpaint' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "image-outpaint_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "image-outpaint",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/image-outpaint_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "image-outpaint_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "image-outpaint",
  "error": null,
  "output": {
    "media_url": ["https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/image-outpaint_019dxxxx/output.png"],
    "media_type": "image/png"
  },
  "created_at": "2026-03-31T10:00:00.000Z",
  "updated_at": "2026-03-31T10:00:15.000Z",
  "completed_at": "2026-03-31T10:00:15.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Image Extender 1.0 API Pricing

Resolution	Price (USD)
Per extended image	$0.12

⚡ Performance

Live usage measured on Pixazo's gateway, split by model version. Generation time is how long a generation takes end-to-end (lower is better). Success rate is the percent of generations that complete (higher is better).

Show data for the last

Generations

800last 30d

~27 per day

Success rate

87.5%

of completed generations

Generation time

34.9savg

p95 38.1s

Requests

Jul 18max 300Aug 16

Image Extender 1.0Avg 27/day

Generation Time

Jul 18max 69.5sAug 16

Image Extender 1.0Avg 34.9s

Error Rate

Jul 18max 50.0%Aug 16

Image Extender 1.0Avg 12.5%

〰 Uptime

Percent of generations that succeeded over the selected period, per model version.

Avg. Success Rate (30d)

87.50%

across all generations of this model family

Uptime

Jul 18max 100%Aug 16

SuccessfulAvg 87.50%