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POST
/
v3
/
gemini-3.1-flash-image-edit
Gemini 3.1 Flash Image Editing
curl --request POST \
  --url https://api.highwayapi.ai/v3/gemini-3.1-flash-image-edit \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: <content-type>' \
  --data '
{
  "size": "<string>",
  "google": {
    "web_search": true,
    "image_search": true
  },
  "prompt": "<string>",
  "image_urls": [
    {}
  ],
  "aspect_ratio": "<string>",
  "image_base64s": [
    {}
  ],
  "output_format": "<string>"
}
'
{
  "image_urls": [
    {}
  ],
  "grounding_metadata": {}
}
Edit images with natural language prompts using the Gemini 3.1 Flash model. Supports URL and Base64-encoded images as input, with up to 14 reference images.

​
Request Headers

​
Content-Type
string
required
Enum value: application/json
​
Authorization
string
required
Bearer authentication format: Bearer {{API key}}.

​
Request Body

​
size
string
default:"1K"
The pixel size of the output image. 0.5K (about 512px), 1K (about 1024px), 2K (about 2048px), 4K (about 4096px). Defaults to 1K.Available values: 0.5K, 1K, 2K, 4K
​
google
object
Google Search options
​
prompt
string
required
Text prompt describing the desired image editing effect
​
image_urls
array
List of input image URLs to edit. Supports up to 14 reference images.Array length: 0 - 14
​
aspect_ratio
string
The aspect ratio of the output image. Supports standard ratios and newly added ultra-wide/ultra-tall ratios (1:4, 4:1, 1:8, 8:1)Available values: 1:1, 1:4, 1:8, 2:3, 3:2, 3:4, 4:1, 4:3, 4:5, 5:4, 8:1, 9:16, 16:9, 21:9
​
image_base64s
array
List of Base64-encoded images to edit. The total number of image_urls and image_base64s cannot exceed 14.Array length: 0 - 14
​
output_format
string
default:"image/png"
The MIME type of the output image. Supported formats: image/png, image/jpeg. Defaults to image/png.Available values: image/png, image/jpeg

​
Response Information

​
image_urls
array
required
List of edited image URLs
​
grounding_metadata
object
Model grounding metadata. Returned when Google server-side tools (such as Search) are called. Note: Tool calls depend on Google. Enabling tools does not guarantee that a tool call will be triggered 100% of the time.