Audio Tools
Text to Speech
Convert text to spoken audio using your browser's built-in speech synthesis engine.
0 / 5,000 characters
First use downloads 63MB — after that it's cached forever.
How it works
100% on-device: Voice models are downloaded once, then cached in your browser's Origin Private File System. No text or audio is ever sent to any server.
Powered by Piper TTS — a fast neural TTS engine from the Rhasspy project. Voice models are open-source (MIT) and hosted on Hugging Face.
Works on every device: Chrome, Safari, Firefox, Edge — desktop and mobile. No microphone or special permissions required.
Your text is processed locally on your device. OptiPix never sees what you type.
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About Text to Speech
OptiPix Text to Speech converts written text to spoken audio using the Web Speech Synthesis API built into your browser. Choose from all available system voices grouped by language. Adjust speech speed (0.5x to 2x) and pitch. The tool highlights the current word as it reads. Supports dozens of languages including English, Spanish, French, German, Japanese, Chinese, Hindi, and Arabic. Most voices run on-device with no network calls. Long text is automatically split into manageable chunks.
How It Works
The tool uses the Web Speech Synthesis API (SpeechSynthesisUtterance) built into modern browsers. It queries available voices via speechSynthesis.getVoices(), applies your speed/pitch settings, and reads the text aloud with word-level highlighting.
Use Cases
- •Have articles read aloud while multitasking
- •Proofread writing by listening
- •Language learning pronunciation
- •Accessibility for visually impaired users
- •Create audio content from written text
Frequently Asked Questions
What languages are supported?
Can I control the speed?
Is this processed on my device?
Can I download the audio?
Is there a character limit?
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