Zero-Shot Voice Cloning
Generate new speech from a short reference recording without training a separate custom speaker model.
Index TTS 2: Expressive Voice Cloning & Emotion Control
Generate expressive AI speech with zero-shot voice cloning and flexible emotion control for dialogue, narration, characters, and dubbing.
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Reference voice · Required Upload a clean 3–10 second recording of an authorized voice.
Advanced settings
Emotional audio
Audio Examples
Listen to official Index TTS examples before generating your own.
English
“Silvia was the adoration of france and her talent was the real support of all the comedies which the greatest authors wrote for her especially of the plays of marivaux for without her his comedies would never have gone to posterity.”
English
“You know, I wasn’t sure what to expect at first. But after hearing the result, I was genuinely surprised. The voice sounds natural, the pacing feels right, and even the small pauses make it feel much more human.”
What Is Index TTS 2?
Index TTS 2 (IndexTTS2) is an expressive AI text-to-speech model built for zero-shot voice cloning and emotion-controlled speech generation. It uses reference audio to guide voice characteristics while allowing emotional delivery to be controlled separately.
This makes Index TTS 2 useful for dialogue, narration, character voices, dubbing, and other workflows where the same reference voice needs different styles of delivery.
Index TTS 2 also explores timing-aware speech synthesis for use cases such as dubbing and audiovisual production, where the length and delivery of generated speech can matter.
Independent Emotion Control
Guide emotional delivery separately from the reference voice to create different expressive styles from the same voice input.
Expressive Speech Generation
Create speech for dialogue, narration, characters, dubbing, and other content that benefits from more than neutral text reading.
Performance-Focused Workflows
Use expressive voice generation for projects that need greater control over emotion and delivery across different lines and scenes.
Key Features of Index TTS 2
Index TTS 2 is designed for expressive AI speech, combining zero-shot voice cloning with flexible emotion control so you can shape how a line is delivered while keeping the reference voice characteristics consistent.
Zero-Shot Voice Cloning
Use a short reference recording to generate new speech without training a separate custom speaker model.
Voice and Emotion Separation
Guide voice characteristics and emotional delivery separately, allowing the same reference voice to produce different expressive styles.
Emotion Reference Audio
Use a separate emotion reference to guide delivery without relying on the speaker recording to provide both voice and emotional style.
Text-Guided Emotion
Use text-based emotion guidance to shape the intended delivery without changing the reference voice input.
Emotion Intensity Control
Adjust the strength of emotional expression to create subtler or more pronounced delivery for different scenes and content.
Expressive Speech Workflows
Use Index TTS 2 for dialogue, narration, character voices, dubbing, and other projects that benefit from more control over emotional delivery.
Voice and Emotion, Controlled Separately
Index TTS 2 separates the reference voice from emotional guidance, so you can shape how a line is delivered without changing the voice input used for generation.
Text
Reference Voice
Guides the voice characteristics of the generated speech.
Emotion Guidance
Shapes the emotional direction and expressive delivery.
Index TTS 2
Generated Speech
One reference voice. Multiple expressive styles.
Control Emotion in Index TTS 2
Index TTS 2 offers multiple ways to shape emotional delivery. Choose the method that fits your workflow, whether you have an emotion reference, prefer text-based guidance, or need more structured control.
Emotion Reference Audio
Use a separate expressive recording to guide the emotional style of generated speech while the reference voice continues to guide voice characteristics.
Best when you already have a performance that matches the emotion or delivery style you want.
Text-Guided Emotion
Describe the intended emotional delivery with text instead of providing a separate emotion recording.
Useful for quickly testing different expressive directions with the same script and reference voice.
Emotion Vectors
Use structured emotion controls to adjust expressive characteristics more directly when your workflow needs consistent, repeatable settings.
Useful for testing controlled variations across multiple lines or generations.
Index TTS 2 Voice Samples
Listen to expressive speech generated with Index TTS 2, including emotion-guided delivery and timing-focused examples.
Expressive Speech
Hear how Index TTS 2 handles emotion-guided speech for dialogue, narration, characters, and other expressive voice workflows.
Listen to Sample
Emotion-Controlled Delivery
Compare different emotional directions while using the same reference voice to understand how delivery can change across generations.
Listen to Sample
Timing-Aware Speech
Explore examples designed around different target durations to see how Index TTS 2 approaches timing-sensitive speech generation for dubbing and audiovisual workflows.
Listen to Samples
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Duration-Aware Speech in Index TTS 2
Index TTS 2 explores duration-controlled text-to-speech for workflows where generated speech needs to fit a target speaking window, such as dubbing, animation, and audiovisual production.
Controlled Duration
Generate speech toward a target duration for timing-sensitive content.
Free Generation
Generate speech without a fixed duration, allowing the model to follow its natural speaking pace.
Duration-control capabilities are part of the Index TTS 2 research and model design. Availability in this hosted generator depends on the connected backend.
How to Use Index TTS 2
Create expressive AI speech with Index TTS 2 in four steps. Enter your text, add an authorized reference voice, choose an emotion-guidance method, and preview the generated result.
- 01
Enter Your Text
Add the dialogue, narration, character line, or other text you want Index TTS 2 to generate as speech.
- 02
Upload a Reference Voice
Use a clean recording from a voice you own or have permission to use. Clear speech from a single speaker with minimal background noise generally works best.
- 03
Choose Emotion Guidance
Shape the delivery using the emotion controls available in your workflow, such as emotion reference audio, text-guided emotion, or supported structured controls.
- 04
Generate and Preview
Generate the speech and listen to the result. Check voice similarity, emotional delivery, pronunciation, pacing, and overall quality, then adjust your inputs or settings if needed.
Want a detailed walkthrough? Read How to Use Index TTS →
Index TTS 2 Use Cases
Use Index TTS 2 for expressive voice generation, emotion-guided speech, and creative workflows that need more control over delivery than standard text-to-speech.
Character Dialogue
Generate expressive character dialogue from an authorized reference voice and explore different emotional directions across scenes and lines.
Animation and Dubbing
Create emotion-guided dialogue for animation, dubbing, and other audiovisual workflows where delivery and timing both matter.
Games and Interactive Stories
Generate character lines with different emotional styles for games, interactive dialogue, narrative experiences, and prototypes.
Audiobooks and Narration
Add more expressive delivery to narration and character dialogue while using consistent reference voices across longer-form content.
Storytelling
Create calm, dramatic, tense, reflective, or emotionally varied speech for stories, narrative content, and character-driven projects.
Creative Voiceovers
Explore expressive voiceovers for trailers, branded content, presentations, short films, and other performance-focused media.
Index TTS 2 FAQ
Find answers about expressive text-to-speech, zero-shot voice cloning, emotion control, reference audio, model differences, and online generation.
1. What is Index TTS 2?
Index TTS 2, also known as IndexTTS2, is an expressive text-to-speech model built for zero-shot voice cloning and emotion-controlled speech generation. It separates reference voice characteristics from emotional guidance, giving users more flexibility over how generated speech is delivered.
2. Does Index TTS 2 support voice cloning?
Yes. It supports zero-shot voice cloning from a short reference recording, so you can generate new speech without training a separate custom speaker model for each voice.
For best results, use clear reference audio from a voice you own or have permission to use.
3. How does emotion control work?
The model can use emotion guidance separately from the main speaker reference. Depending on the workflow, emotional delivery can be guided with reference audio, text-based instructions, or supported structured emotion controls.
This makes it possible to explore different expressive styles while continuing to use the same reference voice.
4. What is the difference between the speaker reference and emotion reference?
The speaker reference guides the voice characteristics of the generated speech.
An emotion reference provides a separate example of the delivery or emotional style you want to reproduce. Keeping these inputs separate gives you more control over voice and expression.
5. Can I adjust emotion intensity?
Supported workflows can adjust how strongly emotional guidance influences the generated speech. Lower intensity can produce more restrained delivery, while stronger settings can create more pronounced expression.
The exact controls available depend on the generation interface and backend being used.
6. What kind of reference audio works best?
Use a clean recording with:
- one speaker
- clear speech
- consistent volume
- minimal background noise, music, or echo
A short, high-quality reference is generally more useful than a noisy or inconsistent recording.
7. Does Index TTS 2 support duration-controlled speech?
Index TTS 2 introduced research into duration-aware speech synthesis for timing-sensitive applications such as dubbing and audiovisual production.
Availability of direct duration controls in this hosted service depends on the connected production backend, so research capabilities should not be assumed to be available as an online control.
8. What is the difference between Index TTS 2 and Index TTS 2.5?
Index TTS 2 is primarily focused on expressive speech, emotion guidance, and voice–emotion separation.
Index TTS 2.5 builds on the model family with broader multilingual support, expanded pronunciation guidance, direct speaking-speed control, and other production-oriented improvements.
9. What can I use Index TTS 2 for?
Common workflows include character dialogue, narration, audiobooks, games, animation, dubbing, storytelling, and creative voiceovers.
It is particularly useful when emotional delivery matters more than producing a neutral text reading.
10. Can I use Index TTS 2 online on this site?
Yes. This site provides a hosted workflow for generating speech with supported Index TTS models. Enter your text, upload an authorized reference recording, configure the available emotion settings, and preview the generated audio online.
Generation on this service uses credits; current options are listed on the Pricing page.
Try Index TTS 2 Online
Generate expressive AI speech with zero-shot voice cloning and flexible emotion control. Start with a short authorized reference recording, shape the delivery, and preview the result online.
Use only voices you own or have permission to use.