Is this English text-to-speech really free?

Yes. The page is public, no signup is required, and there are no credit limits. The voice model runs entirely in your browser. For studio-grade voices and longer narration, see the paid Subformer Voice Synthesis service.

How does the English TTS work in the browser?

It uses an open-source neural TTS engine compiled to WebAssembly and run on your own device. The voice model (~60 MB) is downloaded on first use and cached in your browser's Origin Private File System. Subsequent visits skip the download entirely.

Is my text uploaded to a server?

No. Synthesis runs locally in your browser. The only network calls are to download the voice model and the inference runtime - both are static assets. Your text and the generated audio never leave your device.

Does it work offline?

Once the voice model is cached, yes. The first visit needs network access to download the model; after that the page can synthesize speech offline.

What's the difference between this free English TTS and the paid Voice Synthesis service?

The free in-browser TTS uses a medium-quality open-source voice - fine for narration drafts, accessibility, and quick previews, but it sounds noticeably synthetic. The paid Subformer Voice Synthesis service uses studio-grade neural models, supports voice cloning, and produces broadcast-quality audio. Visit /dashboard/voice-synthesis to try it.

Which browsers are supported?

Any modern browser with WebAssembly: Chrome, Firefox, Safari 15+, Edge, and Chromium-based mobile browsers. The page runs ORT in single-threaded mode so it works in every common browser without requiring cross-origin isolation.

Can I download the audio?

Yes. After synthesis you can play the audio inline or click Download to save it as a 22 kHz mono WAV file. Use any audio editor to convert to MP3 or other formats.

Subformer

Free · No signup · Runs in your browser

Free English Text to Speech

English

Type or paste English text and hear it spoken - all in your browser, with no signup. The voice model is downloaded once (~60 MB) and cached locally, so subsequent runs are instant and work offline.

How it works

1. Type your text
Paste or type any English text - punctuation and line breaks are honored.
2. Generate
First click downloads the ~60 MB voice model to your browser. After that, synthesis is instant.
3. Download or play
Play the audio inline or save it as a WAV file. The audio never leaves your device.

Your text stays on your device

Synthesis runs entirely in your browser using WebAssembly. The only network requests are to fetch the voice model and the inference runtime - both are public, static assets. We don't see your text and we don't see the generated audio.

How the English voice runs in your browser

This is a real neural TTS model executing on your own machine, not a thin client for a hosted API. Four pieces make that possible in a tab.

Open-source neural voice: The English model is trained on a single speaker, which is why the accent and delivery stay consistent across everything you synthesize.
WebAssembly: Both the model runtime and the step that turns English text into phonemes are compiled to WebAssembly, so code originally written for the desktop runs at near-native speed inside the browser sandbox.
On-device inference: The model's neural network is executed locally, pinned to single-threaded mode so the page never needs cross-origin isolation and works in every modern browser.
Origin Private File System: The ~60 MB voice model is cached in a private, per-origin store after the first run. Later visits skip the download and synthesize with no network at all.

Need broadcast-quality voices?

Subformer Voice Synthesis - studio-grade English TTS

The free in-browser tool above is great for drafts and previews, but the open-source voice sounds noticeably synthetic. Subformer's paid Voice Synthesis produces natural, broadcast-grade audio with optional voice cloning.

Try Subformer Voice Synthesis

Premium - also from Subformer

Studio-quality voices

Natural, broadcast-grade English TTS for podcasts, ads, and narration.

Voice cloning

Clone any voice from a short audio sample and reuse it across projects.

Translate & dub

Translate and dub videos into 30+ languages in one click.