# SpeechAI Web > SpeechAI (https://speechai.site/) is a free, modern, AI-powered Text-to-Speech (TTS) web application powered by Microsoft Edge Neural Speech synthesis. It converts written text into lifelike, expressive spoken audio across 140+ languages and dialects with no registration required. ## Core Features - **High-Quality Neural Voices**: Utilizes Microsoft Edge TTS natural neural voices with realistic intonation, pitch, and timing. - **Multilingual Support**: Supports 140+ languages and regional accents (including English, Chinese, Spanish, French, German, Japanese, Korean, Arabic, Russian, Portuguese, Italian, Dutch, etc.). - **Audio Customization**: Real-time control over speech rate (speed), pitch adjustment, and volume. - **Instant Audio Export**: Direct in-browser playback preview and audio file download (MP3/WAV). - **Free & Accessible**: No account creation, subscription, or API key required for web conversion. ## Essential Pages & Tools - [SpeechAI Online TTS Converter](https://speechai.site/): Main interactive speech generator supporting text input, language/voice selection, pitch & rate adjustment, and instant audio playback. - [API Documentation](https://speechai.site/api-docs): Developer guide and documentation for programmatic text-to-speech integration. - [Pricing](https://speechai.site/pricing): Overview of free web tier and API access options. - [Help Center](https://speechai.site/help): User manual, troubleshooting steps, and configuration guidance. - [FAQ](https://speechai.site/faq): Frequently asked questions regarding commercial usage, audio limits, and Edge TTS technology. - [Blog & Guides](https://speechai.site/blog): Technical articles on TTS architecture, AI voice cloning, and audio synthesis tips. ## Technical Specifications - Voice Engine: Microsoft Edge Neural TTS Protocol - Audio Stream Formats: Audio/MPEG (MP3), Audio/WAV - Supported Locales: 140+ Locales (en-US, en-GB, zh-CN, es-ES, fr-FR, de-DE, ja-JP, ko-KR, ar-SA, etc.) - License & Terms: https://speechai.site/terms - Privacy Policy: https://speechai.site/privacy