Black Forest Labs

Black Forest Labs Editing API

Image editing tools (fill, expand, erase).

Documentation GitHub OpenAPI

Operations 2

POST /v1/flux-pro-1.0-fill FLUX.1 Fill [pro] - inpaint with a mask #

POST /v1/flux-pro-1.0-expand FLUX.1 Expand [pro] - outpaint #

Specifications

⚙

OpenAPI

https://raw.githubusercontent.com/api-evangelist/black-forest-labs/refs/heads/main/openapi/black-forest-labs-editing-api-openapi.yml

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OpenAPI Specification

openapi: 3.2.0
info:
  title: Black Forest Labs FLUX Editing API
  description: 'Asynchronous image generation API from Black Forest Labs. Submit a

    generation request to a model-specific endpoint and poll

    `/v1/get_result` (or use the optional webhook callback) for the

    finished image. Includes the FLUX, FLUX.1, and FLUX.2 model families,

    Fill/Expand image editing tools, credit lookup, and fine-tune

    management.

    '
  version: '1.0'
  contact:
    name: Black Forest Labs
    url: https://docs.bfl.ai
servers:
- url: https://api.bfl.ai
  description: Global
- url: https://api.us.bfl.ai
  description: United States region
- url: https://api.eu.bfl.ai
  description: European region (GDPR)
security:
- apiKey: []
tags:
- name: Editing
  description: Image editing tools (fill, expand, erase).
paths:
  /v1/flux-pro-1.0-fill:
    post:
      tags:
      - Editing
      summary: FLUX.1 Fill [pro] - inpaint with a mask
      operationId: generateFluxFill
      requestBody:
        required: true
        content:
          application/json:
            schema:
              allOf:
              - $ref: '#/components/schemas/GenerationRequest'
              - type: object
                required:
                - image
                properties:
                  image:
                    type: string
                    description: Base64-encoded source image.
                  mask:
                    type: string
                    description: Base64-encoded mask image.
      responses:
        '200':
          $ref: '#/components/responses/AsyncResponse'
  /v1/flux-pro-1.0-expand:
    post:
      tags:
      - Editing
      summary: FLUX.1 Expand [pro] - outpaint
      operationId: generateFluxExpand
      requestBody:
        required: true
        content:
          application/json:
            schema:
              allOf:
              - $ref: '#/components/schemas/GenerationRequest'
              - type: object
                required:
                - image
                properties:
                  image:
                    type: string
                    description: Base64-encoded source image.
                  top:
                    type: integer
                  bottom:
                    type: integer
                  left:
                    type: integer
                  right:
                    type: integer
      responses:
        '200':
          $ref: '#/components/responses/AsyncResponse'
components:
  schemas:
    AsyncResponse:
      type: object
      properties:
        id:
          type: string
        polling_url:
          type: string
          format: uri
    GenerationRequest:
      type: object
      properties:
        prompt:
          type: string
        width:
          type: integer
        height:
          type: integer
        aspect_ratio:
          type: string
          example: '16:9'
        seed:
          type: integer
        prompt_upsampling:
          type: boolean
          default: false
        safety_tolerance:
          type: integer
          minimum: 0
          maximum: 6
        output_format:
          type: string
          enum:
          - jpeg
          - png
          - webp
        webhook_url:
          type: string
          format: uri
        webhook_secret:
          type: string
  responses:
    AsyncResponse:
      description: Generation task queued.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/AsyncResponse'
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: x-key
      description: BFL API key.