F5-TTS: Advanced Text-to-Speech API with Voice Cloning Capabilities

F5-TTS is a powerful and flexible Text-to-Speech API that enables high-quality speech synthesis with voice cloning capabilities. This REST API service allows developers to generate natural-sounding speech by using reference audio samples, making it ideal for personalized voice applications, accessibility tools, and content creation platforms.

Key Features

Voice Cloning: Generate speech that matches a reference voice sample
Flexible Input Options: Support for both direct audio file uploads and URL-based audio references
Customizable Speech Parameters: Control speech speed and silence removal
High-Quality Output: Generate clear, natural-sounding WAV audio files
Easy Integration: Simple REST API interface with comprehensive documentation

Technical Specifications

Input Formats: WAV audio files
Output Format: High-quality WAV audio
API Protocol: REST
Response Type: Audio file download
Cross-Platform Compatible: Supports integration with any platform via standard HTTP requests

Core Capabilities

Reference voice matching using provided audio samples
Optional automatic transcription of reference audio
Adjustable speech speed modification (speed multiplier)
Silence removal for optimized output
Health monitoring and system status checking
Cross-Origin Resource Sharing (CORS) support for web applications

Use Cases

Custom voice assistants and chatbots
Personalized audio content creation
Accessibility solutions for visual impairments
Educational content development
Voice-over production
Multimedia applications
Text-based content vocalization

Performance and Reliability

Built on FastAPI for high-performance async operations
Robust error handling and status monitoring
Automatic cleanup of temporary files
Comprehensive health checking system
Production-ready API implementation

API Examples

Health Check

curl -X GET "http://your-server/health" \
     -H "accept: application/json"

Generate Speech with Local Audio File

curl -X POST "http://your-server/tts/generate" \
     -H "accept: application/json" \
     -H "Content-Type: multipart/form-data" \
     -F "reference_audio=@/path/to/your/reference.wav" \
     -F "text=Hello, this is a test of the F5-TTS system" \
     -F "speed=1.0" \
     -F "remove_silence=false" \
     -F "reference_text=Optional transcription of reference audio"

Generate Speech with Audio URL

curl -X POST "http://your-server/tts/generate" \
     -H "accept: application/json" \
     -H "Content-Type: multipart/form-data" \
     -F "reference_audio_url=https://example.com/reference.wav" \
     -F "text=Hello, this is a test of the F5-TTS system" \
     -F "speed=1.2" \
     -F "remove_silence=true"

Response Format

All endpoints return appropriate HTTP status codes with detailed error messages when applicable. The TTS generation endpoint returns a WAV audio file in the response body.

Example successful response headers:

Content-Type: audio/wav
Content-Disposition: attachment; filename="generated_audio.wav"

The F5-TTS API provides developers with a robust solution for implementing advanced text-to-speech capabilities with voice cloning features, suitable for both small-scale applications and enterprise-level deployments.