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POST
/
v3
/
nano-banana-2-i2i
Nano Banana 2 Image-to-Image
curl --request POST \
  --url https://api.highwayapi.ai/v3/nano-banana-2-i2i \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: <content-type>' \
  --data '
{
  "prompt": "<string>",
  "image": [
    "<string>"
  ],
  "size": "<string>",
  "quality": "<string>",
  "response_format": "<string>"
}
'
{
  "images": [
    "<string>"
  ]
}
Generate images with the Nano Banana 2 model based on a text prompt and reference images, with support for configuring the image aspect ratio and quality level.

​
Request Headers

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

​
Request Body

​
prompt
string
required
The text prompt used to generate the image. Chinese and English are supported. We recommend keeping it under 1,000 characters.
​
image
string | string[]
required
Reference image(s) for image-to-image generation. Supports image URLs or Base64 encoding. You can pass a single image (string) or multiple images (string array).
​
size
string
default:"1x1"
The aspect ratio of the output image. The system automatically maps it to the corresponding pixel dimensions.Available values: 1x1, 2x3, 3x2, 3x4, 4x3, 4x5, 5x4, 9x16, 16x9, 21x9
​
quality
string
default:"1k"
The image generation quality level. Higher quality can generate clearer, more detailed images.Available values: 1k, 2k, 4k
​
response_format
string
default:"url"
The return format for the generated image.Available values: url, b64_json

​
Response Information

​
images
string[]
required
The generated image array. Each element is an image URL (when response_format is url) or a Base64-encoded string (when response_format is b64_json).