Subformer
Free · No signup · Runs in your browser

Free Text to Speech in 44+ Languages

Pick a language below, paste any text, and hear it spoken - all in your browser. The voice model is downloaded once (~60 MB) and cached locally, so subsequent runs are instant and work offline.

Private by default

Synthesis runs locally. Your text never leaves your device.

Instant after first load

Voice models are cached in your browser. Subsequent runs work offline.

Free, no signup

No account, no credits, no usage cap. Open and use.

Choose a language

Under the hood

This is a real neural text-to-speech model executing on your own machine, not a thin client for a hosted API. Here is what makes that possible in a browser tab.

Open-source neural voices
Each language ships its own voice model, trained on a single speaker, which is why quality and accent stay consistent within a voice.
WebAssembly
The model runtime and the text-to-phoneme step are both compiled to WebAssembly. That is what lets code originally written for the desktop run at near-native speed inside a sandboxed tab.
On-device inference
The voice model's neural network is executed locally, pinned to single-threaded mode so the page works without cross-origin isolation and stays compatible with every modern browser.
Origin Private File System
Voice models are cached in a private, per-origin store after the first download. Later visits skip the download entirely and synthesis works with no network at all.

Nothing here needs a server, which is why the tool is free and has no usage cap. The trade-off is quality: on-device models are a fraction of the size of the hosted ones, so they sound more synthetic than the paid Voice Synthesis below.

Need broadcast-quality voices?

Subformer Voice Synthesis - studio-grade TTS

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

Try Subformer Voice Synthesis