ElevenLabs Text to Speech API

openapi: 3.1.0
info:
  title: ElevenLabs Text to Speech API
  description: >-
    The ElevenLabs Text to Speech API converts text into lifelike spoken audio
    with nuanced intonation, pacing, and emotional awareness. It supports
    multiple output formats including MP3, PCM, and mu-law, and offers a range
    of models such as Eleven v3, Flash v2.5 for ultra-low latency real-time
    applications, and Multilingual v2 for support across 70+ languages.
    Developers can select from thousands of pre-built voices or use custom
    cloned voices to generate speech that sounds natural and expressive.
  version: '1.0'
  contact:
    name: ElevenLabs Support
    url: https://help.elevenlabs.io
  termsOfService: https://elevenlabs.io/terms-of-service
externalDocs:
  description: ElevenLabs Text to Speech API Documentation
  url: https://elevenlabs.io/docs/api-reference/text-to-speech/convert
servers:
  - url: https://api.elevenlabs.io
    description: Production Server
tags:
  - name: Text to Dialogue
    description: >-
      Endpoints for converting text scripts with multiple speakers into
      dialogue audio.
  - name: Text to Speech
    description: >-
      Endpoints for converting text into speech audio with configurable voice,
      model, and output format settings.
security:
  - apiKeyAuth: []
paths:
  /v1/text-to-speech/{voice_id}:
    post:
      operationId: createSpeech
      summary: Create speech
      description: >-
        Converts text into speech using a specified voice. Returns audio in the
        requested format. Supports voice settings overrides and pronunciation
        dictionary locators for fine-tuned output.
      tags:
        - Text to Speech
      parameters:
        - $ref: '#/components/parameters/voiceId'
        - $ref: '#/components/parameters/outputFormat'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToSpeechRequest'
      responses:
        '200':
          description: Audio file generated successfully
          content:
            audio/mpeg:
              schema:
                type: string
                format: binary
        '400':
          description: Bad request - invalid parameters
        '401':
          description: Unauthorized - invalid or missing API key
        '422':
          description: Unprocessable entity - validation error
  /v1/text-to-speech/{voice_id}/stream:
    post:
      operationId: streamSpeech
      summary: Stream speech
      description: >-
        Converts text into speech and streams the audio back as chunked
        transfer encoding. Useful for real-time playback scenarios where
        latency is important.
      tags:
        - Text to Speech
      parameters:
        - $ref: '#/components/parameters/voiceId'
        - $ref: '#/components/parameters/outputFormat'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToSpeechRequest'
      responses:
        '200':
          description: Streaming audio response
          content:
            audio/mpeg:
              schema:
                type: string
                format: binary
        '400':
          description: Bad request - invalid parameters
        '401':
          description: Unauthorized - invalid or missing API key
        '422':
          description: Unprocessable entity - validation error
  /v1/text-to-speech/{voice_id}/with-timestamps:
    post:
      operationId: createSpeechWithTimestamps
      summary: Create speech with timing
      description: >-
        Converts text into speech and returns both the audio and word-level
        timing information. Useful for applications that need to synchronize
        text display with audio playback.
      tags:
        - Text to Speech
      parameters:
        - $ref: '#/components/parameters/voiceId'
        - $ref: '#/components/parameters/outputFormat'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToSpeechRequest'
      responses:
        '200':
          description: Audio with timestamp data
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TimestampedAudioResponse'
        '400':
          description: Bad request - invalid parameters
        '401':
          description: Unauthorized - invalid or missing API key
        '422':
          description: Unprocessable entity - validation error
  /v1/text-to-speech/{voice_id}/stream/with-timestamps:
    post:
      operationId: streamSpeechWithTimestamps
      summary: Stream speech with timing
      description: >-
        Converts text into speech and streams the audio along with word-level
        timing information. Combines the benefits of streaming delivery with
        timestamp synchronization data.
      tags:
        - Text to Speech
      parameters:
        - $ref: '#/components/parameters/voiceId'
        - $ref: '#/components/parameters/outputFormat'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToSpeechRequest'
      responses:
        '200':
          description: Streaming audio with timestamp data
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TimestampedAudioResponse'
        '400':
          description: Bad request - invalid parameters
        '401':
          description: Unauthorized - invalid or missing API key
        '422':
          description: Unprocessable entity - validation error
  /v1/text-to-dialogue:
    post:
      operationId: createDialogue
      summary: Create dialogue
      description: >-
        Converts a dialogue script with multiple speakers into audio. Each
        segment of the script can be assigned a different voice, enabling
        multi-speaker audio generation from a single request.
      tags:
        - Text to Dialogue
      parameters:
        - $ref: '#/components/parameters/outputFormat'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToDialogueRequest'
      responses:
        '200':
          description: Dialogue audio generated successfully
          content:
            audio/mpeg:
              schema:
                type: string
                format: binary
        '400':
          description: Bad request - invalid parameters
        '401':
          description: Unauthorized - invalid or missing API key
        '422':
          description: Unprocessable entity - validation error
  /v1/text-to-dialogue/with-timestamps:
    post:
      operationId: createDialogueWithTimestamps
      summary: Create dialogue with timestamps
      description: >-
        Converts a dialogue script with multiple speakers into audio and
        returns word-level timing information alongside the generated audio.
      tags:
        - Text to Dialogue
      parameters:
        - $ref: '#/components/parameters/outputFormat'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToDialogueRequest'
      responses:
        '200':
          description: Dialogue audio with timestamp data
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TimestampedAudioResponse'
        '400':
          description: Bad request - invalid parameters
        '401':
          description: Unauthorized - invalid or missing API key
        '422':
          description: Unprocessable entity - validation error
components:
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: xi-api-key
      description: >-
        ElevenLabs API key passed in the xi-api-key header for authentication.
  parameters:
    voiceId:
      name: voice_id
      in: path
      required: true
      description: >-
        The identifier of the voice to use for speech synthesis. Use the
        Voices API to list available voices.
      schema:
        type: string
    outputFormat:
      name: output_format
      in: query
      required: false
      description: >-
        The desired output audio format. Supported values include mp3_44100_128,
        mp3_44100_192, pcm_16000, pcm_22050, pcm_24000, pcm_44100, ulaw_8000.
      schema:
        type: string
        default: mp3_44100_128
        enum:
          - mp3_22050_32
          - mp3_44100_32
          - mp3_44100_64
          - mp3_44100_96
          - mp3_44100_128
          - mp3_44100_192
          - pcm_16000
          - pcm_22050
          - pcm_24000
          - pcm_44100
          - ulaw_8000
  schemas:
    TextToSpeechRequest:
      type: object
      required:
        - text
      properties:
        text:
          type: string
          description: >-
            The text to convert to speech. Maximum length varies by model.
        model_id:
          type: string
          description: >-
            The identifier of the model to use. Use GET /v1/models to list
            available models. The model must support text to speech.
          default: eleven_monolingual_v1
        voice_settings:
          $ref: '#/components/schemas/VoiceSettings'
        pronunciation_dictionary_locators:
          type: array
          description: >-
            A list of pronunciation dictionary locators to apply to the text.
            Applied in order, with a maximum of 3 locators per request.
          items:
            $ref: '#/components/schemas/PronunciationDictionaryLocator'
          maxItems: 3
        seed:
          type: integer
          description: >-
            A seed value for deterministic generation. Using the same seed
            with the same parameters produces the same audio output.
        previous_text:
          type: string
          description: >-
            Text that came before the current text for context continuity.
        next_text:
          type: string
          description: >-
            Text that comes after the current text for context continuity.
        language_code:
          type: string
          description: >-
            Language code for the text, in ISO 639-1 format. Helps the model
            produce more accurate pronunciation for the specified language.
    TextToDialogueRequest:
      type: object
      required:
        - segments
      properties:
        model_id:
          type: string
          description: >-
            The identifier of the model to use for dialogue generation.
        segments:
          type: array
          description: >-
            An array of dialogue segments, each with a speaker voice and text.
          items:
            $ref: '#/components/schemas/DialogueSegment'
    DialogueSegment:
      type: object
      required:
        - voice_id
        - text
      properties:
        voice_id:
          type: string
          description: >-
            The voice identifier for this segment of dialogue.
        text:
          type: string
          description: >-
            The text content for this segment of dialogue.
        voice_settings:
          $ref: '#/components/schemas/VoiceSettings'
    VoiceSettings:
      type: object
      description: >-
        Voice settings that override the stored settings for the given voice.
        Applied only on the current request.
      properties:
        stability:
          type: number
          description: >-
            Controls the stability of the generated voice. Higher values
            produce more consistent output, lower values add variability.
          minimum: 0
          maximum: 1
        similarity_boost:
          type: number
          description: >-
            Controls how closely the AI adheres to the original voice.
            Higher values increase similarity to the target voice.
          minimum: 0
          maximum: 1
        style:
          type: number
          description: >-
            Controls the expressiveness and style of the speech delivery.
            Higher values produce more expressive speech.
          minimum: 0
          maximum: 1
          default: 0
        use_speaker_boost:
          type: boolean
          description: >-
            Enables speaker boost to increase voice clarity and reduce
            background artifacts.
          default: true
    PronunciationDictionaryLocator:
      type: object
      required:
        - pronunciation_dictionary_id
        - version_id
      properties:
        pronunciation_dictionary_id:
          type: string
          description: >-
            The identifier of the pronunciation dictionary.
        version_id:
          type: string
          description: >-
            The version identifier of the pronunciation dictionary.
    TimestampedAudioResponse:
      type: object
      properties:
        audio_base64:
          type: string
          description: >-
            Base64 encoded audio data.
        alignment:
          type: object
          description: >-
            Word-level timing information for the generated audio.
          properties:
            characters:
              type: array
              description: >-
                Array of characters with their timing information.
              items:
                type: object
                properties:
                  character:
                    type: string
                    description: The character.
                  start_time:
                    type: number
                    description: Start time in seconds.
                  end_time:
                    type: number
                    description: End time in seconds.