> ## Documentation Index
> Fetch the complete documentation index at: https://doc.rapida.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Google Cloud TTS

> Configure Google Cloud Text-to-Speech in assistant-api.

Google Cloud Text-to-Speech offers WaveNet and Neural2 voices across 100+ languages and variants.

**Provider identifier:** `google-speech-service`

***

## Vault Credential

| Key   | Description                       |
| ----- | --------------------------------- |
| `key` | Google Cloud service account JSON |

***

## Setup

<Steps>
  <Step title="Create a Google Cloud service account">
    In [Google Cloud Console](https://console.cloud.google.com) → **IAM & Admin → Service Accounts**, create a service account with the **Cloud Text-to-Speech User** role. Download the JSON key file.
  </Step>

  <Step title="Add to Rapida vault">
    In the Rapida dashboard → **Credentials → Create Credential**, select provider **Google**, paste the service account JSON as `key`.

    The same credential is used for both Google Cloud STT and TTS.
  </Step>

  <Step title="Configure the assistant">
    In the assistant settings → **TTS Provider**, select **Google Speech**.

    | Option          | Example           | Description                                                                        |
    | --------------- | ----------------- | ---------------------------------------------------------------------------------- |
    | `language`      | `en-US`           | BCP-47 language code                                                               |
    | `voice_name`    | `en-US-Neural2-A` | Voice name — see [voice list](https://cloud.google.com/text-to-speech/docs/voices) |
    | `speaking_rate` | `1.0`             | Speed multiplier (0.25–4.0)                                                        |
    | `pitch`         | `0.0`             | Pitch adjustment in semitones (-20.0–20.0)                                         |
  </Step>
</Steps>

***

<CardGroup cols={2}>
  <Card title="Google Cloud STT" icon="audio-waveform" href="/opensource/services/assistant-api/stt/google">
    Google Cloud speech-to-text
  </Card>

  <Card title="TTS Overview" icon="volume" href="/opensource/services/assistant-api/tts/overview">
    All TTS providers
  </Card>
</CardGroup>