> ## Documentation Index > Fetch the complete documentation index at: https://docs.comfy.org/llms.txt > Use this file to discover all available pages before exploring further. # Upload an image file > Upload an image file to cloud storage. Image limits: - Maximum file size: 50 MB - Maximum width/height per edge: 16384 px - Maximum total pixel count: 64 megapixels (67108864 pixels) Uploads that exceed any of these limits are rejected with HTTP 400. ## OpenAPI ````yaml /openapi-cloud.yaml post /api/upload/image openapi: 3.0.3 info: title: Comfy Cloud API description: > **Experimental API:** This API is experimental and subject to change. Endpoints, request/response formats, and behavior may be modified without notice. API for Comfy Cloud - Run ComfyUI workflows on cloud infrastructure. This API allows you to interact with Comfy Cloud programmatically, including: - Submitting and managing workflows - Uploading and downloading files - Monitoring job status and progress ## Cloud vs OSS ComfyUI Compatibility Comfy Cloud implements the same API interfaces as OSS ComfyUI for maximum compatibility, but some fields are accepted for compatibility while being handled differently or ignored: | Field | Endpoints | Cloud Behavior | |-------|-----------|----------------| | `subfolder` | `/api/view`, `/api/upload/*` | **Ignored** - Cloud uses content-addressed storage (hash-based). Returned in responses for client-side organization. | | `type` (input/output/temp) | `/api/view`, `/api/upload/*` | Partially used - All files stored with tag-based organization rather than directory structure. | | `overwrite` | `/api/upload/*` | **Ignored** - Content-addressed storage means identical content always has the same hash. | | `number`, `front` | `/api/prompt` | **Ignored** - Cloud uses its own fair queue scheduling per user. | | `split`, `full_info` | `/api/userdata` | **Ignored** - Cloud always returns full file metadata. | These fields are retained in the API schema for drop-in compatibility with existing ComfyUI clients and workflows. version: 1.0.0 license: name: GNU General Public License v3.0 url: https://github.com/comfyanonymous/ComfyUI/blob/master/LICENSE servers: - url: https://cloud.comfy.org description: Comfy Cloud API security: - ApiKeyAuth: [] tags: - name: workflow description: | Submit workflows for execution and manage the execution queue. This is the primary way to run ComfyUI workflows on the cloud. - name: job description: | Monitor job status, view execution history, and manage running jobs. Jobs are created when you submit a workflow via POST /api/prompt. - name: asset description: | Upload, download, and manage persistent assets (images, models, outputs). Assets provide durable storage with tagging and metadata support. - name: file description: | Legacy file upload and download endpoints compatible with local ComfyUI. For new integrations, consider using the Assets API instead. - name: model description: | Browse available AI models. Models are pre-loaded on cloud infrastructure. - name: node description: | Get information about available ComfyUI nodes and their inputs/outputs. Useful for building dynamic workflow interfaces. - name: user description: | User account information and personal data storage. - name: system description: | Server status, health checks, and system information. paths: /api/upload/image: post: tags: - file summary: Upload an image file description: | Upload an image file to cloud storage. Image limits: - Maximum file size: 50 MB - Maximum width/height per edge: 16384 px - Maximum total pixel count: 64 megapixels (67108864 pixels) Uploads that exceed any of these limits are rejected with HTTP 400. operationId: uploadImage requestBody: required: true content: multipart/form-data: schema: type: object required: - image properties: image: type: string format: binary description: The image file to upload overwrite: type: string description: > Whether to overwrite existing file (true/false). **Note:** Accepted for ComfyUI API compatibility but effectively ignored in cloud. Cloud uses content-addressed storage (hash-based deduplication), so identical content always maps to the same hash. Re-uploading the same content is a no-op. subfolder: type: string description: > Optional subfolder path. **Note:** Accepted for ComfyUI API compatibility but **ignored** for storage. Cloud stores assets by hash only. The subfolder is returned in the response for client-side organization but is not used for server-side storage paths. type: type: string description: > Upload type (defaults to "output"). **Note:** Accepted for ComfyUI API compatibility. Cloud stores all uploads as assets with tags rather than directory-based organization. responses: '200': description: Image uploaded successfully content: application/json: schema: type: object properties: name: type: string description: Filename of the uploaded image subfolder: type: string description: Subfolder path where image was saved type: type: string description: Type of upload (e.g., "output") '400': description: Bad request content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: schemas: ErrorResponse: type: object required: - code - message properties: code: type: string message: type: string securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: > API key authentication. Generate an API key from your account settings at https://platform.comfy.org/profile/api-keys. Pass the key in the X-API-Key header. ````