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Chatterbox Text to Speech

fal-ai/chatterbox/text-to-speech
Whether you're working on memes, videos, games, or AI agents, Chatterbox brings your content to life. Use the first tts from resemble ai.
Inference
Commercial use
Schema
LLMs
PlaygroundAPI

About

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1. Calling the API#

Install the client#

The client provides a convenient way to interact with the model API.

npm install --save @fal-ai/client

Setup your API Key#

Set FAL_KEY as an environment variable in your runtime.

export FAL_KEY="YOUR_API_KEY"

Submit a request#

The client API handles the API submit protocol. It will handle the request status updates and return the result when the request is completed.

import { fal } from "@fal-ai/client";

const result = await fal.subscribe("fal-ai/chatterbox/text-to-speech", {
  input: {
    text: "I just found a hidden treasure in the backyard! Check it out!"
  },
  logs: true,
  onQueueUpdate: (update) => {
    if (update.status === "IN_PROGRESS") {
      update.logs.map((log) => log.message).forEach(console.log);
    }
  },
});
console.log(result.data);
console.log(result.requestId);

2. Authentication#

The API uses an API Key for authentication. It is recommended you set the FAL_KEY environment variable in your runtime when possible.

API Key#

In case your app is running in an environment where you cannot set environment variables, you can set the API Key manually as a client configuration.
import { fal } from "@fal-ai/client";

fal.config({
  credentials: "YOUR_FAL_KEY"
});

3. Queue#

Submit a request#

The client API provides a convenient way to submit requests to the model.

import { fal } from "@fal-ai/client";

const { request_id } = await fal.queue.submit("fal-ai/chatterbox/text-to-speech", {
  input: {
    text: "I just found a hidden treasure in the backyard! Check it out!"
  },
  webhookUrl: "https://optional.webhook.url/for/results",
});

Fetch request status#

You can fetch the status of a request to check if it is completed or still in progress.

import { fal } from "@fal-ai/client";

const status = await fal.queue.status("fal-ai/chatterbox/text-to-speech", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b",
  logs: true,
});

Get the result#

Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.

import { fal } from "@fal-ai/client";

const result = await fal.queue.result("fal-ai/chatterbox/text-to-speech", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b"
});
console.log(result.data);
console.log(result.requestId);

4. Files#

Some attributes in the API accept file URLs as input. Whenever that's the case you can pass your own URL or a Base64 data URI.

Data URI (base64)#

You can pass a Base64 data URI as a file input. The API will handle the file decoding for you. Keep in mind that for large files, this alternative although convenient can impact the request performance.

Hosted files (URL)#

You can also pass your own URLs as long as they are publicly accessible. Be aware that some hosts might block cross-site requests, rate-limit, or consider the request as a bot.

Uploading files#

We provide a convenient file storage that allows you to upload files and use them in your requests. You can upload files using the client API and use the returned URL in your requests.

import { fal } from "@fal-ai/client";

const file = new File(["Hello, World!"], "hello.txt", { type: "text/plain" });
const url = await fal.storage.upload(file);

Read more about file handling in our file upload guide.

5. Schema#

Input#

text string* required

The text to be converted to speech. You can additionally add the following emotive tags: <laugh>, <chuckle>, <sigh>, <cough>, <sniffle>, <groan>, <yawn>, <gasp>

audio_url string

Optional URL to an audio file to use as a reference for the generated speech. If provided, the model will try to match the style and tone of the reference audio. Default value: "https://storage.googleapis.com/chatterbox-demo-samples/prompts/male_rickmorty.mp3"

exaggeration float

Exaggeration factor for the generated speech (0.0 = no exaggeration, 1.0 = maximum exaggeration). Default value: 0.25

temperature float

Temperature for generation (higher = more creative). Default value: 0.7

cfg float

Default value: 0.5

seed integer

Useful to control the reproducibility of the generated audio. Assuming all other properties didn't change, a fixed seed should always generate the exact same audio file. Set to 0 for random seed..

{
  "text": "I just found a hidden treasure in the backyard! Check it out!",
  "audio_url": "https://storage.googleapis.com/chatterbox-demo-samples/prompts/male_rickmorty.mp3",
  "exaggeration": 0.25,
  "temperature": 0.7,
  "cfg": 0.5
}

Output#

Other types#

ChatterboxTurboRequest#

text string* required

The text to be converted to speech. You can add paralinguistic tags: [clear throat], [sigh], [shush], [cough], [groan], [sniff], [gasp], [chuckle], [laugh]

voice string

Preset voice to use for synthesis. Choose from available voices or provide a custom audio URL. Default value: "lucy"

audio_url string

Optional URL to a custom audio file (5-10 seconds) for voice cloning. If provided, this overrides the preset voice selection.

temperature float

Temperature for generation. Higher values create more varied speech patterns. Default value: 0.8

seed integer

Random seed for reproducible results. Set to 0 for random generation.

File#

url string* required

The URL where the file can be downloaded from.

content_type string

The mime type of the file.

file_name string

The name of the file. It will be auto-generated if not provided.

file_size integer

The size of the file in bytes.

file_data string

File data

ChatterboxVCRequest#

source_audio_url string* required
target_voice_audio_url string

Optional URL to an audio file to use as a reference for the generated speech. If provided, the model will try to match the style and tone of the reference audio.

ChatterboxMultilingualRequest#

text string* required

The text to be converted to speech (maximum 300 characters). Supports 23 languages including English, French, German, Spanish, Italian, Portuguese, Hindi, Arabic, Chinese, Japanese, Korean, and more.

voice string

Language code for synthesis. In case using custom please provide audio url and select custom_audio_language. Default value: "english"

custom_audio_language CustomAudioLanguageEnum

If using a custom audio URL, specify the language of the audio here. Ignored if voice is not a custom url.

Possible enum values: english, arabic, danish, german, greek, spanish, finnish, french, hebrew, hindi, italian, japanese, korean, malay, dutch, norwegian, polish, portuguese, russian, swedish, swahili, turkish, chinese

exaggeration float

Controls speech expressiveness and emotional intensity (0.25-2.0). 0.5 is neutral, higher values increase expressiveness. Extreme values may be unstable. Default value: 0.5

temperature float

Controls randomness and variation in generation (0.05-5.0). Higher values create more varied speech patterns. Default value: 0.8

cfg_scale float

Configuration/pace weight controlling generation guidance (0.0-1.0). Use 0.0 for language transfer to mitigate accent inheritance. Default value: 0.5

seed integer

Random seed for reproducible results. Set to 0 for random generation, or provide a specific number for consistent outputs.

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