> ## Documentation Index > Fetch the complete documentation index at: https://docs.dify.ai/llms.txt > Use this file to discover all available pages before exploring further. # Convert Audio to Text > **Available for**: Chatflow, Workflow, Chatbot, Agent, Text Generator apps. Convert audio file to text. The uploaded file's MIME type must be one of `audio/mp3`, `audio/m4a`, `audio/wav`, `audio/amr`, `audio/mpga`; other types, including the common `audio/mpeg`, are rejected with the `unsupported_audio_type` error. File size limit is `30 MB`. ## OpenAPI ````yaml /en/api-reference/openapi_service.json post /audio-to-text openapi: 3.0.1 info: title: Dify Service API description: >- REST API for Dify applications and knowledge bases. Application endpoints authenticate with an app API key; knowledge endpoints authenticate with a dataset API key. version: 1.0.0 servers: - url: https://{api_base_url} description: >- Base URL of the Dify Service API. For self-hosted deployments, replace it with your own API base URL. variables: api_base_url: default: api.dify.ai/v1 description: Host and path of the API base URL, without the `https://` prefix. security: - ApiKeyAuth: [] tags: - name: Chat Messages description: Operations related to chat messages and interactions. - name: Files description: File upload and preview operations. - name: End Users description: Operations related to end user information. - name: Feedback description: User feedback operations. - name: Conversations description: Operations related to managing conversations. - name: Audio description: Text-to-Speech and Speech-to-Text operations. - name: Applications description: Operations to retrieve application settings and information. - name: Annotations description: Operations related to managing annotations for direct replies. - name: Human Input description: Endpoints for resuming paused workflows that require human input. - name: Workflow Runs description: Operations for executing and managing workflows. - name: Completion Messages description: Operations related to text generation and completion. - name: Knowledge Bases description: >- Operations for managing knowledge bases, including creation, configuration, and retrieval. - name: Documents description: >- Operations for creating, updating, and managing documents within a knowledge base. - name: Chunks description: Operations for managing document chunks and child chunks. - name: Metadata description: >- Operations for managing knowledge base metadata fields and document metadata values. - name: Tags description: Operations for managing knowledge base tags and tag bindings. - name: Models description: Operations for retrieving available models. - name: Knowledge Pipeline description: >- Operations for managing and running knowledge pipelines, including datasource plugins and pipeline execution. paths: /audio-to-text: post: tags: - Audio summary: Convert Audio to Text description: >- **Available for**: Chatflow, Workflow, Chatbot, Agent, Text Generator apps. Convert audio file to text. The uploaded file's MIME type must be one of `audio/mp3`, `audio/m4a`, `audio/wav`, `audio/amr`, `audio/mpga`; other types, including the common `audio/mpeg`, are rejected with the `unsupported_audio_type` error. File size limit is `30 MB`. operationId: audioToText requestBody: required: true content: multipart/form-data: schema: $ref: '#/components/schemas/AudioToTextRequest' responses: '200': description: Successfully converted audio to text. content: application/json: schema: $ref: '#/components/schemas/AudioToTextResponse' examples: audioToTextSuccess: summary: Response Example value: text: >- Hello, I would like to know more about the iPhone 13 Pro Max. '400': description: >- - `app_unavailable` : App unavailable or misconfigured. - `no_audio_uploaded` : No audio file was uploaded. - `provider_not_support_speech_to_text` : Model provider does not support speech-to-text. - `provider_not_initialize` : No valid model provider credentials found. - `provider_quota_exceeded` : Model provider quota exhausted. - `model_currently_not_support` : Current model does not support this operation. - `completion_request_error` : Speech recognition request failed. content: application/json: examples: app_unavailable: summary: app_unavailable value: status: 400 code: app_unavailable message: App unavailable, please check your app configurations. no_audio_uploaded: summary: no_audio_uploaded value: status: 400 code: no_audio_uploaded message: Please upload your audio. provider_not_support_speech_to_text: summary: provider_not_support_speech_to_text value: status: 400 code: provider_not_support_speech_to_text message: Provider not support speech to text. provider_not_initialize: summary: provider_not_initialize value: status: 400 code: provider_not_initialize message: >- No valid model provider credentials found. Please go to Settings -> Model Provider to complete your provider credentials. provider_quota_exceeded: summary: provider_quota_exceeded value: status: 400 code: provider_quota_exceeded message: >- Your quota for Dify Hosted OpenAI has been exhausted. Please go to Settings -> Model Provider to complete your own provider credentials. model_currently_not_support: summary: model_currently_not_support value: status: 400 code: model_currently_not_support message: >- Dify Hosted OpenAI trial currently not support the GPT-4 model. completion_request_error: summary: completion_request_error value: status: 400 code: completion_request_error message: Completion request failed. '413': description: '`audio_too_large` : Audio file size exceeded the limit.' content: application/json: examples: audio_too_large: summary: audio_too_large value: status: 413 code: audio_too_large message: Audio size exceeded. '415': description: '`unsupported_audio_type` : Audio type is not allowed.' content: application/json: examples: unsupported_audio_type: summary: unsupported_audio_type value: status: 415 code: unsupported_audio_type message: Audio type not allowed. '500': description: '`internal_server_error` : Internal server error.' content: application/json: examples: internal_server_error: summary: internal_server_error value: status: 500 code: internal_server_error message: Internal server error. components: schemas: AudioToTextRequest: type: object description: Request body for audio-to-text conversion. required: - file properties: file: type: string format: binary description: >- Audio file. Validated by MIME type: `audio/mp3`, `audio/m4a`, `audio/wav`, `audio/amr`, or `audio/mpga`. Limit: `30 MB`. user: type: string description: User identifier. AudioToTextResponse: type: object properties: text: type: string description: Output text from speech recognition. securitySchemes: ApiKeyAuth: type: http scheme: bearer bearerFormat: API_KEY description: >- API Key authentication. For all API requests, include your API Key in the `Authorization` HTTP Header, prefixed with `Bearer `. Example: `Authorization: Bearer {API_KEY}`. **Strongly recommend storing your API Key on the server-side, not shared or stored on the client-side, to avoid possible API-Key leakage that can lead to serious consequences.** Requests with a missing or invalid API key fail with HTTP `401` and error code `unauthorized`. ````