AI Text-to-Speech (KittenTTS Mini)

Free AI Text to Speech with KittenTTS - Browser-Based TTS Tool

What is KittenTTS and how does it work?

KittenTTS is a family of open-source text-to-speech models based on the StyleTTS 2 architecture that generates natural-sounding speech entirely in your browser. The tool converts your text into phonemes using a phonemizer, then processes them through a neural network running on WebAssembly or WebGPU. No data is sent to any server - all inference happens locally on your device after a one-time model download.

Which KittenTTS model should I choose?

The three KittenTTS variants offer different trade-offs between quality, speed, and download size:

• KittenTTS Mini (80M parameters, ~79MB): Highest speech quality with expressive prosody. Best for content where naturalness matters most. Runs on WASM.
• KittenTTS Nano (15M parameters, ~56MB): Fastest inference speed and supports WebGPU acceleration in Chrome and Edge. Good balance of quality and performance.
• KittenTTS Micro (40M parameters, ~41MB): Smallest download, making it ideal for slower connections. Runs on WASM.

All three models share the same 8 voice options and speed control.

What voices are available for KittenTTS?

KittenTTS includes 8 built-in voices: Bella, Jasper, Luna, Bruno, Rosie, Hugo, Kiki, and Leo. Each voice has distinct pitch and tonal characteristics. You can also adjust the speaking speed from 0.5x to 2.0x to match your needs for faster narration or slower, clearer speech.

Can I download the generated audio as a file?

Yes. After generating speech, you can play it directly in the browser and download it as a WAV file. KittenTTS outputs 24kHz mono audio, which is suitable for voiceovers, presentations, accessibility features, and podcast production.

Is my text private when using this AI speech tool?

All processing runs entirely in your browser. Your text is never uploaded to any server. The AI model is downloaded once from Hugging Face and cached locally, so subsequent uses start instantly. This makes the tool safe for confidential documents, personal messages, or business content.

How does KittenTTS compare to cloud-based TTS services?

While cloud services like Google Cloud TTS or Amazon Polly may offer more languages and voices, KittenTTS provides competitive speech quality with key advantages: zero per-character costs, complete data privacy, offline capability after the initial download, and no account required. For English text-to-speech without recurring fees, KittenTTS is a practical alternative.

Can I use KittenTTS for long texts?

The tool automatically splits longer texts into sentence-level chunks, processes them sequentially, and concatenates the results into a single audio file. There are no artificial length limits - your device's memory and processing power are the only constraints.

What browsers support KittenTTS?

All modern browsers that support WebAssembly can run KittenTTS, including Chrome, Edge, Firefox, and Safari. KittenTTS Nano additionally supports WebGPU acceleration in Chromium-based browsers for faster generation. Use an up-to-date version of Chrome or Edge for the best experience.

Free text-to-speech for accessibility and content creation

This tool is well-suited for creating audio versions of blog posts, generating voiceovers for videos, testing scripts before recording, or making written content accessible to visually impaired users. Since it runs locally with no usage limits, you can generate as much audio as needed without any account or subscription.

Related tools for your audio workflow

After generating speech, you can visualize the audio waveform with our Audio to Video Visualizer to create shareable video clips. If you need to go the other direction and transcribe audio back to text, try our AI Audio Transcriber powered by Whisper AI. For a different voice style, you can also try the MMS-TTS English text-to-speech model.