TTSbox: A Fully In-Browser Voice Suite (Free, No Signup)

Most “free” AI voice tools fall into one of two traps: they upload your audio and text to a server you don’t control, or they gate everything behind a signup and a credit card. TTSbox does neither. The whole suite — text-to-speech, voice cloning, and speech-to-text — runs locally in your browser on WebGPU.

What’s in the box

• Text to speech with built-in voices, in six languages.
• Voice cloning from a short sample — your voice stays on your device.
• Speech to text via Whisper-class models, transcribed locally.

After the model files are cached in your browser, nothing you type, record, or generate leaves your machine. That’s not a marketing line — it’s how the architecture works. The inference happens in your tab.

Who it’s for

• Creators who want AI voiceover for short-form video without a subscription.
• Anyone with sensitive audio — interviews, meetings, medical or legal recordings — that should never touch a third-party server.
• People who just want a fast, free tool with no account to manage.

The honest limit

A browser is a great place to run AI for free and privately, but it has real ceilings: long-form generation is slower, the voice library is smaller than a cloud studio, and there’s no API for automation. When you outgrow the browser — batch production, commercial-grade cloning at scale, a voice API — that’s where a cloud studio earns its keep.

Try it

Everything below runs in your browser right now, no signup:

• Text to speech
• Voice cloning
• Speech to text