Text to speech

IndexTTS

Speech synthesis with voice cloning and precise duration control, handy for video dubbing. Controls emotion separately from timbre.

Developer
bilibili, China
First release
Mar 2025
Latest release
Aug 2026
Sizes
about 1B – 2B
License
Commercial use with conditionsIndexTTS and 1.5 are Apache 2.0; IndexTTS2 and 2.5 use the bilibili Model License (free, but with restrictions for very large companies)
Russian
Not supported
Ready-made builds
GGUF, MLX (Apple)
Running
On your own serverNeeds a GPU
Industries
Media and production, Marketing and content
Deploy on your server Hugging Face GitHub

What it does

  • Video dubbing matched to timing
  • Voice cloning
  • Emotional voiceover

Where it is used

Media and video productionGamesMarketing

Hardware requirements

LaptopLaptop or regular PC, up to 8 GB of VRAM — smaller versions
fits
1 GPUOne GPU with 16–80 GB — mid-size versions
fits
ClusterServer with several GPUs — flagship versions
no versions

Versions

  1. IndexTTS 2.5
  2. IndexTTS2
  3. IndexTTS 1.5
  4. IndexTTS

How to run it

On your own serverWeights are downloaded from Hugging Face and served with vLLM (load and API) or llama.cpp (modest hardware). The model then runs in a closed network with no per-request fees.Hugging Face
How much hardware you needCalculate the VRAM for the model size, context length and number of concurrent requests.Open the hardware calculator

I can set this up end to end: pick the model size, deploy it on your server and connect it to your systems. Quantization compresses a model so it takes less video memory and runs on more modest hardware. Answers change slightly, so quality is checked on your own examples.

Frequently asked questions

Can IndexTTS be used in a commercial project?

With conditions. License: IndexTTS and 1.5 are Apache 2.0; IndexTTS2 and 2.5 use the bilibili Model License (free, but with restrictions for very large companies). Restrictions vary — region, company revenue, attribution requirements. Have a lawyer check the terms before a commercial launch.

What hardware does IndexTTS need?

At minimum: Laptop or regular PC, up to 8 GB of VRAM — smaller versions. Without a GPU the model is not practical. You can calculate the exact VRAM for your model size and context in the hardware calculator.

Does IndexTTS support Russian?

No. The model card lists its languages and Russian is not among them.

Where can I download IndexTTS and what does it cost?

The IndexTTS weights are open and free to download. You only pay for the hardware it runs on and for the setup. Source links are at the bottom of this page.

How I deploy it for clients

  1. SelectionI pick the model size for your task and hardware and test it on your examples.
  2. DeploymentI deploy it on your server or in a closed network and provide an API.
  3. Fine-tuningI fine-tune it on your data (LoRA) or connect a knowledge base — whichever is cheaper for the task.
  4. IntegrationI connect it to your CRM, ERP, bot, website or team chat and set up monitoring.

Similar models

Text to speechCosyVoice / Fun-CosyVoiceAlibaba (Tongyi, FunAudioLLM) · ChinaCommercial use allowed

Speech synthesis with voice cloning from a short sample and streaming output for live dialogue. Version 3 supports 9 languages, including Russian.

DetailsText to speechFish Speech / OpenAudioFish Audio · USA / ChinaNon-commercial only

Speech synthesis with voice cloning and emotion control in 80+ languages, including Russian. Quality is close to paid services, but the weights are for research only.

DetailsText to speechQwen3-TTSAlibaba (Qwen) · ChinaCommercial use allowed

Speech synthesis in 10 languages, including Russian: voice cloning from 3 seconds, ready-made voices and creating a voice from a text description.

Details

Source: huggingface.co/IndexTeam/IndexTTS-2.5. Data checked against the model card on 22 Sep 2026. Have a lawyer review the license before commercial launch.