Stability AI Outpaint API

openapi: 3.2.0
info:
  title: Stability AI Stable Image Edit Outpaint API
  description: The Stability AI Stable Image Edit API provides image editing capabilities including inpainting, outpainting, object erasing, background removal, and search-and-replace functionality. Developers can use natural language prompts to modify existing images, fill in masked regions, extend image boundaries, or replace specific objects within a scene. These tools enable advanced image manipulation workflows without requiring traditional image editing expertise.
  version: v2beta
  contact:
    name: Stability AI Support
    url: https://platform.stability.ai
  termsOfService: https://stability.ai/terms-of-service
servers:
- url: https://api.stability.ai
  description: Production Server
security:
- bearerAuth: []
tags:
- name: Outpaint
  description: Extend the boundaries of an image by generating new content that seamlessly continues the existing scene in any direction.
paths:
  /v2beta/stable-image/edit/outpaint:
    post:
      operationId: editImageOutpaint
      summary: Extend an image beyond its boundaries
      description: Extends an image by generating new content beyond its current boundaries. Specify the number of pixels to extend in each direction and optionally provide a text prompt to guide the content of the extended regions. The generated content seamlessly continues the existing scene.
      tags:
      - Outpaint
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/OutpaintRequest'
      responses:
        '200':
          description: Successfully outpainted image
          content:
            image/jpeg:
              schema:
                type: string
                format: binary
            image/png:
              schema:
                type: string
                format: binary
            image/webp:
              schema:
                type: string
                format: binary
            application/json:
              schema:
                $ref: '#/components/schemas/EditImageResponse'
        '400':
          description: Bad request due to invalid parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized due to missing or invalid API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden due to content moderation or insufficient permissions
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    OutpaintRequest:
      type: object
      required:
      - image
      properties:
        image:
          type: string
          format: binary
          description: The source image to extend.
        prompt:
          type: string
          maxLength: 10000
          description: Optional text describing what should appear in the extended regions.
        left:
          type: integer
          minimum: 0
          description: Number of pixels to extend to the left.
        right:
          type: integer
          minimum: 0
          description: Number of pixels to extend to the right.
        up:
          type: integer
          minimum: 0
          description: Number of pixels to extend upward.
        down:
          type: integer
          minimum: 0
          description: Number of pixels to extend downward.
        seed:
          type: integer
          minimum: 0
          maximum: 4294967294
          default: 0
          description: A value to control randomness in generation.
        output_format:
          type: string
          enum:
          - jpeg
          - png
          - webp
          default: png
          description: The output format of the edited image.
    EditImageResponse:
      type: object
      properties:
        image:
          type: string
          description: Base64-encoded image data when Accept header is set to application/json.
        finish_reason:
          type: string
          enum:
          - SUCCESS
          - CONTENT_FILTERED
          description: The reason the edit finished.
        seed:
          type: integer
          description: The seed used for generation.
    ErrorResponse:
      type: object
      properties:
        id:
          type: string
          description: A unique identifier for the error instance.
        name:
          type: string
          description: The error type name.
        message:
          type: string
          description: A human-readable description of the error.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key authentication. Pass your Stability AI API key as a Bearer token in the Authorization header.
externalDocs:
  description: Stability AI API Documentation
  url: https://platform.stability.ai/docs/api-reference