Index TTS

What Is Index TTS?

Index TTS (IndexTTS) is an online AI text-to-speech and zero-shot voice cloning platform that lets you generate natural, expressive speech from text and short reference audio using the IndexTTS model family.

With Index TTS, you can enter text, upload an authorized reference voice, and generate new speech that follows the voice characteristics of the reference recording. You can preview the result, update your script, and regenerate audio as needed.

The Index TTS model family includes multiple generations with different capabilities for speech quality, expression, timing, language support, and voice control. Explore each model to find the workflow that best fits your project.

Text to Speech

Convert written text into natural AI speech for videos, education, apps, games, media, and other creative projects.

Voice Cloning

Use a short authorized reference recording to generate new speech with similar voice characteristics.

Expressive Control

Control aspects of speech delivery such as expression, timing, and pronunciation with supported Index TTS models.

Multiple Models

Compare Index TTS generations and choose the model that matches your needs for voice quality, control, and workflow.

Why Choose Index TTS for AI Text to Speech and Voice Cloning?

Index TTS brings AI text-to-speech and reference-based voice cloning into one online workflow, so you can turn scripts into natural speech, preview the results, and refine your audio without recording every line manually.

Natural AI Text to Speech

Convert scripts, dialogue, narration, lessons, and other written content into natural-sounding AI speech you can preview and regenerate as needed.

Zero-Shot Voice Cloning

Use a short authorized reference recording to guide the generated voice without training a separate speaker model for each new script.

Expressive Voice Generation

Adjust expression, pacing, pronunciation, and other delivery controls supported by your selected Index TTS model.

Flexible Model Workflows

Choose between Index TTS models based on your needs for voice quality, expression, timing, language support, and speech control.

Listen to Index TTS Voice Samples

Hear natural and expressive speech generated with Index TTS models across narration, dialogue, and long-form delivery.

Natural English Narration

Index TTS 2.5EnglishZero-shot

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Spoken text

“Animal Liberation and the RSPCA are again calling for mandatory CCTV cameras in Australian abattoirs.”

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Long-Form Narration

Index TTS 2.5EnglishZero-shot

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Spoken text

“The U.S. says it received information mentioning potential attacks on prominent landmarks in Ethiopia and Kenya.”

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Factual Narration

Index TTS 2EnglishExpressive

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Spoken text

“These are two of only three known formations to have dinosaur fossils in Antarctica.”

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Natural Dialogue

Index TTS 2EnglishExpressive

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Spoken text

“The man looked at him without responding.”

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Compare Index TTS Models

Explore the Index TTS model family and compare available generations for voice cloning, expressive speech, multilingual synthesis, and different production workflows.

Index TTS

The original Index TTS model for zero-shot text-to-speech and reference-based voice cloning.

Explore Index TTS →

Index TTS 2

Designed for more expressive speech generation with expanded control over emotion, timing, and delivery.

Explore Index TTS 2 →

Index TTS 2.5

A newer Index TTS generation with expanded multilingual capabilities and additional controls for speech generation.

Explore Index TTS 2.5 →

How to Use Index TTS in 4 Steps

Enter your text, upload a short authorized reference voice, choose your model and settings, and generate natural AI speech. Preview the result and refine your text or settings until it sounds right.

1. 01 — Enter Your Text

   Add the script, dialogue, narration, or other text you want Index TTS to turn into speech.

2. 02 — Upload a Reference Voice

   Upload a clean reference recording from a voice you own or have permission to use.

3. 03 — Choose Your Model and Settings

   Select an available Index TTS model and adjust the supported voice, expression, timing, or pronunciation settings for your project.

4. 04 — Generate and Preview

   Generate your speech, listen to the result, and refine your text or settings before generating again or using the audio in your project.

Want a step-by-step guide? Read How to Use Index TTS →

01

Video Voiceovers

Create AI voiceovers for explainers, tutorials, product videos, social content, and other visual media.

02

Character Dialogue

Generate new dialogue from an authorized reference voice for characters, storytelling, games, and creative projects.

03

Multilingual and Localized Content

Use supported Index TTS models to create speech for multilingual and localized content workflows.

04

Education and Learning

Turn lessons, guides, training materials, and educational content into clear spoken audio.

05

Podcasts and Audiobooks

Generate narration in sections so individual lines, chapters, or passages can be revised and regenerated as needed.

06

AI Assistants and Prototypes

Add generated speech to AI assistants, product demos, learning tools, characters, and other interactive experiences.

Flexible Credit-Based Pricing

Generate Index TTS speech online using credits. Choose the option that fits your project and usage needs.

Index TTS FAQ

Find answers about Index TTS, AI text-to-speech, zero-shot voice cloning, reference audio, model selection, pricing, and usage.

Start Generating with Index TTS

Generate natural AI speech from your text and a short authorized reference recording. Try Index TTS online or follow the step-by-step guide to get started.

Use only voices you own or have permission to use.