Privacy Policy: 影片日文翻譯中文 (Chrome extension)

Last updated: August 2026

影片日文翻譯中文 (Japanese Live Subtitles) is a Chrome extension that turns a tab's audio into live Traditional Chinese subtitles. Speech recognition and translation both run on your own machine — we operate no server that receives your content.

We collect nothing

  • This extension does not collect, store or transmit any personally identifiable information.
  • There is no account system, no sign-up and no login.
  • There is no analytics, no tracking pixel and no advertising SDK.

How tab audio is handled

  • Audio capture starts only after you click "Start", using Chrome's tabCapture on that one tab.
  • Audio exists only in browser memory, is passed to a speech model running locally on your device, and is discarded right after processing.
  • The audio, the recognised Japanese and the translated Chinese never leave your computer and are never written to any file or database.
  • Closing the tab or pressing stop ends the capture immediately.

Where translation runs

  • Translation uses Chrome's built-in on-device AI models (Gemini Nano / Chrome Translator) that the browser downloads to your machine.
  • Translation requests are not sent to Google, to us, or to any third-party API.
  • No paid cloud AI service is involved.

The only outbound connection

  • The extension connects to huggingface.co for one purpose: downloading the weights of the open-source Whisper speech recognition model.
  • This download happens the first time a model is used and is cached by the browser afterwards. It is a one-way download.
  • The request contains none of your audio, subtitles, browsing history or personal data.

What is stored locally

  • chrome.storage.local holds only your preferences: subtitle size, subtitle mode, speech engine, model tier, subtitle flow and subtitle position.
  • These stay on your device and are never synced to us.
  • Removing the extension deletes them.

Sharing and selling

  • We do not sell or transfer data to third parties, because we never receive any.
  • No data is used for creditworthiness, lending, or any purpose unrelated to the extension's single feature.

Contact

  • For privacy questions, email hello@ai-windmill.com.
  • Any change to this policy is reflected in the "Last updated" date on this page.