IndexTTS2 is a production-ready text-to-speech platform that delivers emotionally expressive, duration-controlled, zero-shot voice synthesis for English and Chinese. It takes text input and generates speech with precise timing, emotional nuance, and voice cloning—all through a web interface.
What is IndexTTS2?
IndexTTS2 is a text-to-speech engine that combines autoregressive synthesis with GPT embeddings to produce natural-sounding speech. It accepts text up to 120 characters per generation (Free) or 1000 characters (Pro), and outputs audio with control over emotional tone and duration. The platform is developed by the IndexTTS2 team and runs entirely in the browser via a web app.
Key Features
- Precise Timing Control — Specify exact speech duration with frame-accurate token specifications while maintaining natural prosody.
- Rich Emotional Range — Capture emotions like joy, tranquility, anger, and anxiety without additional training data.
- Voice-Emotion Separation — Independently adjust vocal tone and emotional delivery for complete creative control.
- Natural Language Emotion — Shape emotional tone through simple text descriptions powered by Qwen3 AI understanding.
- Zero-Shot Cloning — Clone any voice from a short audio sample (upload or record) without fine-tuning.
- Stable Speech Generation — Leverages advanced autoregressive synthesis for consistent, reliable output.
- Commercial Use (Pro) — Pro plan includes commercial licensing and priority generation.
Who is it for?
- Video dubbing teams — Sync character dialogue to on-screen action with precise timing.
- Game developers — Generate reactive NPC dialog and companion voices without recording sessions.
- Podcast and audiobook producers — Produce consistent host reads or localized editions across languages.
- Educators and trainers — Generate curricula, learning tracks, and compliance training at scale.
- AI agent developers — Give autonomous agents distinctive voices with emotional nuance.
What can you do with IndexTTS2?
- Video Dubbing: Match lip movements and scene timing with frame-accurate speech control for multimedia projects.
- Games & Virtual Characters: Create dynamic, emotionally responsive dialogue for non-player characters.
- Podcasts & Audiobooks: Produce long-form audio with consistent voice quality across episodes.
- Education & Training: Scale voiceover production for e-learning modules and corporate training.
Pricing
IndexTTS2 offers a Freemium model. The Free plan includes up to 120 characters per generation, 20,000 characters per month, 3 custom voice uploads (or recordings), and access to preset voices. The Pro plan (recommended) includes up to 1000 characters per generation, 1,000,000 characters per month, 20 custom voices, commercial use allowed, and priority generation. View full pricing →
FAQ
Is IndexTTS2 free?
Yes, there is a free tier with 20,000 characters per month and up to 3 custom voices. For higher usage and commercial rights, the Pro plan starts at a monthly subscription.
What languages does IndexTTS2 support?
IndexTTS2 supports English and Chinese for both input text and voice synthesis.
Can I control the emotional tone of the speech?
Yes, you can either choose an emotion from the voice reference, upload an emotion reference audio (Pro), or describe the emotion in natural language—all without additional training.
How do I clone a voice?
You can upload an audio sample (or record directly) and IndexTTS2 will perform zero-shot cloning, instantly replicating the voice without any fine-tuning.
What are the character limits?
Free users can generate up to 120 characters per request; Pro users can generate up to 1000 characters per request. Monthly caps are 20,000 and 1,000,000 characters respectively.
