Qwen3-TTS Integration

Run Alibaba's Qwen3-TTS locally for high-quality, multilingual text-to-speech. This guide covers setting up the OpenAI-compatible TTS server included with Libre WebUI.

Overview

Qwen3-TTS is an advanced text-to-speech system featuring:

9 pre-built voices spanning English, Chinese, Japanese, and Korean
10 language support including German, French, Spanish, Italian, Portuguese, and Russian
Voice cloning from 3-second audio samples
Voice design using natural language descriptions
Instruction control for emotion and prosody

The included server wraps Qwen3-TTS in an OpenAI-compatible API, allowing Libre WebUI to use it through the standard plugin system.

Requirements

Component	Minimum	Recommended
Python	3.12+	3.12 (not 3.14)
GPU VRAM	4GB (0.6B models)	8GB+ (1.7B models)
RAM	8GB	16GB+
Disk	5GB	10GB

Platform Support

Platform	Backend	Notes
NVIDIA GPU	CUDA	Best performance, bfloat16 support
Apple Silicon	MPS	Use 0.6B models for memory efficiency
CPU	PyTorch	Slower, use 0.6B models

Apple Silicon Users

Use the customvoice-0.6b model variant on Mac to avoid memory pressure. The 1.7B models may cause system instability on machines with 16GB unified memory.

Quick Start

1. Install the Server

cd examples/qwen-tts-server

# Create virtual environment (Python 3.12 required)
python3.12 -m venv venv
source venv/bin/activate  # Linux/macOS
# or: venv\Scripts\activate  # Windows

# Install dependencies
pip install -r requirements.txt

2. Start the Server

# NVIDIA GPU (recommended)
python server.py --model customvoice-1.7b

# Apple Silicon
python server.py --model customvoice-0.6b

# CPU (slower)
python server.py --model customvoice-0.6b

The server runs at http://localhost:8100 by default.

3. Configure Libre WebUI

The plugin is pre-configured in plugins/qwen-tts.json. Enable it in Settings → Plugins → Qwen3 TTS.

4. Test It

curl http://localhost:8100/v1/audio/speech \
  -H "Content-Type: application/json" \
  -d '{"model": "qwen3-tts", "input": "Hello, welcome to Libre WebUI!", "voice": "Ryan"}' \
  --output speech.wav

Available Models

Model	Size	Use Case
`customvoice-1.7b`	~3.5GB	Pre-built voices with instruction control
`customvoice-0.6b`	~1.5GB	Lightweight variant for limited VRAM
`voicedesign-1.7b`	~3.5GB	Create voices from text descriptions
`base-1.7b`	~3.5GB	Voice cloning from 3-second samples
`base-0.6b`	~1.5GB	Lightweight voice cloning

Voices

Pre-Built Voices (CustomVoice Models)

Voice	Language	Description
Ryan	English	Male, clear and natural
Aiden	English	Male, warm tone
Vivian	Chinese	Female, professional
Serena	Chinese	Female, friendly
Uncle_Fu	Chinese	Male, mature
Dylan	Chinese	Male, Beijing dialect
Eric	Chinese	Male, Sichuan dialect
Ono_Anna	Japanese	Female
Sohee	Korean	Female

OpenAI Voice Aliases

For compatibility with OpenAI TTS clients, the server maps OpenAI voice names:

OpenAI Voice	Maps To
`alloy`	Ryan
`echo`	Aiden
`fable`	Vivian
`onyx`	Uncle_Fu
`nova`	Serena
`shimmer`	Ono_Anna

API Reference

Speech Generation

Endpoint: POST /v1/audio/speech

{
  "model": "qwen3-tts",
  "input": "Text to convert to speech",
  "voice": "Ryan",
  "response_format": "wav",
  "instruct": "Speak with enthusiasm",
  "language": "English"
}

Parameter	Type	Default	Description
`model`	string	`qwen3-tts`	Model identifier
`input`	string	required	Text to synthesize (max 10,000 chars)
`voice`	string	`ryan`	Voice name (see table above)
`response_format`	string	`wav`	Audio format (only `wav` supported)
`instruct`	string	`""`	Emotion/prosody instruction
`language`	string	auto-detect	Override language detection

Response: Audio file (audio/wav)

Voice Design

Endpoint: POST /v1/audio/voice-design

Create custom voices from natural language descriptions.

{
  "model": "qwen3-tts-voicedesign",
  "input": "Welcome to our service.",
  "voice_description": "A warm, friendly female voice with a slight British accent",
  "language": "English"
}

note

Requires the voicedesign-1.7b model to be loaded.

Voice Cloning

Endpoint: POST /v1/audio/voice-clone

Clone a voice from a 3+ second audio sample.

curl -X POST http://localhost:8100/v1/audio/voice-clone \
  -F "input=Hello, this is my cloned voice." \
  -F "[email protected]" \
  -F "reference_text=This is what was said in the reference." \
  --output cloned.wav

Parameter	Type	Description
`input`	string	Text to synthesize
`reference_audio`	file	3+ second audio sample
`reference_text`	string	Transcript of reference audio

note

Requires the base-1.7b or base-0.6b model to be loaded.

List Voices

Endpoint: GET /v1/voices

{
  "voices": [
    {"id": "ryan", "name": "Ryan", "language": "English"},
    {"id": "aiden", "name": "Aiden", "language": "English"},
    ...
  ]
}

Health Check

Endpoint: GET /health

{"status": "healthy", "model_loaded": true}

Server Configuration

python server.py [OPTIONS]

Option	Default	Description
`--host`	`0.0.0.0`	Host to bind to
`--port`	`8100`	Port to bind to
`--model`	`customvoice-1.7b`	Model variant to load

Network Access

To access the server from other machines on your network:

# Start server on all interfaces
python server.py --host 0.0.0.0 --port 8100

# Access from another machine
curl http://192.168.1.100:8100/v1/audio/speech ...

Update the plugin endpoint in plugins/qwen-tts.json:

{
  "endpoint": "http://192.168.1.100:8100/v1/audio/speech",
  "capabilities": {
    "tts": {
      "endpoint": "http://192.168.1.100:8100/v1/audio/speech"
    }
  }
}

Production Features

Text Sanitization

The server automatically sanitizes input text to prevent model hangs:

Removes emojis and symbols
Strips markdown formatting (*bold*, _italic_, etc.)
Collapses repeated characters (FUUUUU → FUU)
Removes stage directions (*(action)*, (whispers))
Normalizes whitespace

Text Chunking

Long text is automatically split at sentence boundaries:

Maximum 500 characters per chunk
30-second timeout per chunk
Failed chunks are skipped, remaining chunks continue
Chunks are concatenated into single audio response

This prevents timeouts on long AI responses while maintaining natural speech flow.

Multi-GPU Setup

For systems with multiple GPUs, the server forces single-GPU execution to avoid tensor device mismatches:

device_map = {"": "cuda:0"}  # Uses first GPU only

To use a specific GPU:

CUDA_VISIBLE_DEVICES=1 python server.py --model customvoice-1.7b

Troubleshooting

Model Download Fails

The model downloads from Hugging Face on first run. If it fails:

# Set Hugging Face token for gated models
export HF_TOKEN=hf_...

# Or download manually
huggingface-cli download Qwen/Qwen3-TTS-12Hz-1.7B-CustomVoice

Out of Memory (Apple Silicon)

RuntimeError: MPS backend out of memory

Use the smaller model variant:

python server.py --model customvoice-0.6b

CUDA Out of Memory

torch.cuda.OutOfMemoryError: CUDA out of memory

Close other GPU applications
Use the 0.6B model variant
Reduce chunk size in server.py (max_chunk_size=300)

Server Times Out

If generation times out on long text:

The server automatically chunks text and continues with remaining chunks
Check server logs for which chunks timed out
Consider shortening your input text

Audio Sounds Wrong

Repeated syllables: Usually caused by emojis or special characters. The sanitizer should handle this automatically.
Wrong language: Set the language parameter explicitly in the request.
Unnatural pauses: Text may be splitting at wrong boundaries. Check for unusual punctuation.

Plugin Configuration

The included plugin (plugins/qwen-tts.json):

{
  "id": "qwen-tts",
  "name": "Qwen3 TTS",
  "type": "tts",
  "endpoint": "http://localhost:8100/v1/audio/speech",
  "auth": {
    "header": "",
    "key_env": ""
  },
  "model_map": [
    "qwen3-tts",
    "qwen3-tts-customvoice",
    "qwen3-tts-voicedesign",
    "qwen3-tts-clone"
  ],
  "capabilities": {
    "tts": {
      "endpoint": "http://localhost:8100/v1/audio/speech",
      "model_map": [
        "qwen3-tts",
        "qwen3-tts-customvoice",
        "qwen3-tts-voicedesign",
        "qwen3-tts-clone"
      ],
      "config": {
        "voices": ["Ryan", "Aiden", "Vivian", "Serena", "Uncle_Fu", "Dylan", "Eric", "Ono_Anna", "Sohee"],
        "default_voice": "Ryan",
        "formats": ["wav"],
        "default_format": "wav",
        "max_characters": 10000,
        "supports_streaming": false,
        "no_auth_required": true
      }
    }
  },
  "description": "Qwen3-TTS local TTS server (NVIDIA CUDA, Apple MPS, or CPU)",
  "documentation_url": "https://github.com/QwenLM/Qwen3-TTS"
}

Resources

Qwen3-TTS GitHub - Official repository
Qwen3-TTS Demo - Try it online
Alibaba Cloud TTS Docs - Cloud API documentation

Overview​

Requirements​

Platform Support​

Quick Start​

1. Install the Server​

2. Start the Server​

3. Configure Libre WebUI​

4. Test It​

Available Models​

Voices​

Pre-Built Voices (CustomVoice Models)​

OpenAI Voice Aliases​

API Reference​

Speech Generation​

Voice Design​

Voice Cloning​

List Voices​

Health Check​

Server Configuration​

Network Access​

Production Features​

Text Sanitization​

Text Chunking​

Multi-GPU Setup​

Troubleshooting​

Model Download Fails​

Out of Memory (Apple Silicon)​

CUDA Out of Memory​

Server Times Out​

Audio Sounds Wrong​

Plugin Configuration​

Resources​