Is this Portuguese 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 Portuguese 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 Portuguese 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.

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免費 Portuguese 文字轉語音

Português

輸入或貼上 Portuguese 文字並收聽其語音 — 全在瀏覽器內，免註冊。語音模型會下載一次（約 60 MB）並快取於本機，後續執行即刻且可離線使用。

運作方式

1. 輸入文字
貼上或輸入任何 Portuguese 文字 - 標點符號與換行會被保留.
2. 生成
第一次點擊會把約 60 MB 的語音模型下載到您的瀏覽器。之後合成即時完成。
3. 下載或播放
在頁面內播放音訊或另存為 WAV 檔。音訊不會離開您的裝置。

您的文字會保留在您的裝置上

合成完全在您的瀏覽器中使用 WebAssembly 執行。唯一的網路請求是獲取語音模型和推論執行時——兩者都是公開的靜態資產。我們看不到您的文字，也看不到生成的音訊。

Portuguese 語音如何在您的瀏覽器中執行

這是一個在您自己的機器上執行的真實類神經 TTS 模型，而不是託管 API 的瘦客戶端。有四個部分使其在分頁中實現。

Open-source neural voice: Portuguese 模型在單一說話者上訓練，這就是為什麼您合成的所有內容的口音和語調保持一致的原因。
WebAssembly: 模型執行時和將 Português 文字轉換為音素的步驟都編譯為 WebAssembly，因此最初為桌面編寫的程式碼在瀏覽器沙箱中以接近原生速度執行。
On-device inference: 模型的類神經網路在本地執行，固定為單執行緒模式，因此頁面無需跨來源隔離，並可在所有現代瀏覽器中運作。
Origin Private File System: 約 60 MB 的語音模型在首次執行後會快取在私有的、每個來源的儲存空間中。之後的造訪會跳過下載，並且完全無需網路即可合成。

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