> ## Documentation Index > Fetch the complete documentation index at: https://docs.hifi.com/llms.txt > Use this file to discover all available pages before exploring further. # Upload a file > Upload a file for use in KYC and other verification flows. The file is sent as `multipart/form-data` with a single field named `file`. Constraints: - Maximum file size is 20 MB. - Only the following MIME types are accepted: `application/pdf`, `image/jpeg`, `image/png`, `image/heic`, `image/tiff`. - Exactly one file may be uploaded per request, in a field named `file`. The response returns a public file identifier (`file_...`) that can be referenced in subsequent requests. ## OpenAPI ````yaml https://production.hifi.com/api/v3/openapi.json post /v3/files openapi: 3.0.0 info: title: Hifi API version: 3.0.0 description: API documentation for HIFI servers: - url: https://production.hifi.com description: Production server - url: https://sandbox.hifi.com description: Sandbox server security: - bearerAuth: [] tags: - name: Common description: Common endpoints - name: User description: User endpoints - name: Counter Party description: Counter party endpoints - name: Crypto Transfer description: Crypto transfer and batch transfer endpoints - name: Wallet description: Wallet and wallet offer endpoints - name: External Account description: External bank account endpoints (under a counter party) - name: External Wallet description: External wallet endpoints (under a counter party) - name: External Card description: External card endpoints (under a counter party) - name: Token Swap description: Token swap endpoints - name: Bridge description: Bridge endpoints - name: Virtual Account description: Virtual account endpoints - name: Compliance description: Compliance and compliance link endpoints - name: Webhook Endpoint description: Webhook endpoint endpoints - name: File description: File upload endpoints - name: Onramp description: Onramp (fiat to crypto) endpoints - name: Offramp description: Offramp (crypto to fiat) endpoints - name: Orchestration Address description: Orchestration (liquidation) address endpoints - name: KYC Link description: Hosted and custom KYC/KYB link endpoints - name: Transfer Approval description: Transfer approval endpoints - name: Corridor description: Supported fiat/crypto transfer corridor endpoints - name: Migration description: v2-to-v3 ID mapping endpoints paths: /v3/files: post: tags: - File summary: Upload a file description: > Upload a file for use in KYC and other verification flows. The file is sent as `multipart/form-data` with a single field named `file`. Constraints: - Maximum file size is 20 MB. - Only the following MIME types are accepted: `application/pdf`, `image/jpeg`, `image/png`, `image/heic`, `image/tiff`. - Exactly one file may be uploaded per request, in a field named `file`. The response returns a public file identifier (`file_...`) that can be referenced in subsequent requests. operationId: v3UploadFile requestBody: $ref: '#/components/requestBodies/UploadFileBody' responses: '200': $ref: '#/components/responses/UploadFileResponse' '400': $ref: '#/components/responses/BadRequestResponse' '401': $ref: '#/components/responses/UnauthorizedResponse' '500': $ref: '#/components/responses/InternalServerErrorResponse' components: requestBodies: UploadFileBody: required: true description: > The file to upload, sent as `multipart/form-data` with a single field named `file`. Maximum size is 20 MB. Accepted MIME types are `application/pdf`, `image/jpeg`, `image/png`, `image/heic`, `image/tiff`. content: multipart/form-data: schema: $ref: '#/components/schemas/FileUploadRequest' encoding: file: contentType: application/pdf, image/jpeg, image/png, image/heic, image/tiff responses: UploadFileResponse: description: File uploaded successfully. content: application/json: schema: $ref: '#/components/schemas/FileObject' example: id: file_9aB0xY4mNpXwZ7bV1aLdt createdAt: '2026-07-01T10:30:00.000Z' fileName: passport.pdf size: 245760 mimeType: application/pdf BadRequestResponse: description: Bad Request — the request was malformed or failed validation. content: application/json: schema: $ref: '#/components/schemas/ApiError' example: type: VALIDATION_ERROR message: One or more fields are invalid or missing. fields: - code: invalid_value message: Must be a valid email address field: email UnauthorizedResponse: description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/Unauthorized' InternalServerErrorResponse: description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/InternalServerError' schemas: FileUploadRequest: type: object required: - file properties: file: type: string format: binary description: > The file to upload. Maximum size is 20 MB. Accepted MIME types are `application/pdf`, `image/jpeg`, `image/png`, `image/heic`, `image/tiff`. FileObject: type: object description: A file that has been uploaded to HIFI. properties: id: type: string description: Public file identifier. example: file_9aB0xY4mNpXwZ7bV1aLdt createdAt: type: string format: date-time description: Timestamp when the file was uploaded, in ISO 8601 format. example: '2026-07-01T10:30:00.000Z' fileName: type: string description: Original name of the uploaded file. example: passport.pdf size: type: integer description: Size of the file in bytes. example: 245760 mimeType: type: string description: MIME type of the uploaded file. enum: - application/pdf - image/jpeg - image/png - image/heic - image/tiff example: application/pdf ApiError: type: object description: >- Standard v3 error shape, returned by validation failures and business-logic errors alike. properties: type: type: string description: >- Machine-readable error type, e.g. VALIDATION_ERROR, ACTION_NOT_ALLOWED, RESOURCE_CONFLICT. example: VALIDATION_ERROR message: type: string description: Human-readable error message. example: One or more fields are invalid or missing. fields: type: array description: >- Present on field-level validation errors. One entry per problem field. items: type: object properties: code: type: string description: Error code related to the field issue. message: type: string description: Error message for the specific issue. field: type: string description: The name of the field that has an issue. Unauthorized: type: object properties: type: type: string description: Unauthorized enum example: UNAUTHORIZED message: type: string description: Unauthorized message example: Authentication required InternalServerError: type: object properties: type: type: string example: INTERNAL_SERVER_ERROR description: Internal server error enum message: type: string example: An internal server error occurred description: Internal server error message securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: JWT ````